13 best pressure manometers

• Updated with 5/16" Pressure Port Size, Fit in most gas valves and you do not need to purchase additional accessories. Flexible silicone tubing size updated to 19” length *1/4” diameter.
• 11 Selectable Units&High Accurate, This gas pressure meter features 11 selectable units of measure. The device measures gauge and differential pressure in the range of ±2 psi. High resolution(0.001psi) gauge.
• Date Hold & Max/Min/Avg Recording, Press the HOLD button momentarily to freeze the displayed reading. Zero function for offset correction or measurement. Press the REC button to access the MIN/MAX/AVG recording mode.
• Multi-Application, Validate pressures in accordance with equipment manufacturer’s specification for optimal system efficiency and safety. Specifically for use in HVAC, pneumatic controls, medical equipment, gas appliance repair and installation, laboratory testing, computer peripherals.
• Portable, The digital gas manometer dimensions:5.79" x 2.16" x1.26", Slim design and the easy button for one hand operation, free up a hand for other work.

User questions & answers

Question:	Does it work on furnaces pressure switches
Answer:	I would contact the seller, they have axing customer service
Question:	Does this work for setting up a propane furnace
Answer:	Thank you for asking, nannio Eye cannot be wall-mounted by itself. But it works perfectly with this twist mount B07XCZF2LS and this corner camera shelf B07M77K2L2 Should you have any questions, please feel free to contact V-LAB.
Question:	Which size "diameter port" to test inlet and manifold pressure on a propane{LP} free standing heating stove? Why two ports on the device
Answer:	The Aurora, Black, and Pro all work best behind a red dot sight. The Aurora and Aurora PRO are both weapons-rated and have been tested on an M4 A5-15 style rifle platform with .223/5.56 caliber at 4,000 rounds. You can mount SiOnyx cameras with a picatinny rail mount using the 1/4”-20 standard mount to nearly any firearm, with the exception of shotguns and air rifles.
Question:	Does this help to check the pressure on my hot water heater to make sure it operating properly and no leaks
Answer:	All Aurora cameras have a standard base mount 1/4-20.

Product features

Digital Manometer HT-1890 (5/16" Diameter Pressure Port)

• Low Range/High-Resolution Gauge or Differential Pressure.
• Measuring Ranges: ±13.79 kPa / ±2 psi / ±55.4 H2O.
• High Accuracy: 0.001psi.
• 11 Selectable Units of measure: inH2O, psi, bar, mbar, kPa, inHg, mmHg, ozin2,FtH2O, cmH2O, kgcm2.
• Large LCD with backlight.
• MAX/MIN/AVG values and Zero function.
• Data Hold and Auto power off functions
• Error Codes for out of range indication.
• Low Battery Indication.

Multi-Application

Specifically for use in HVAC, pneumatic controls, medical equipment, gas appliance repair and installation, laboratory testing,computer peripherals.

Multi-Application

Specifically for use in HVAC, pneumatic controls, medical equipment, gas appliance repair and installation, laboratory testing,computer peripherals.

Multi-Application

Specifically for use in HVAC, pneumatic controls, medical equipment, gas appliance repair and installation, laboratory testing,computer peripherals.

Multi-Application

Specifically for use in HVAC, pneumatic controls, medical equipment, gas appliance repair and installation, laboratory testing,computer peripherals.

Product description

Features:

-Gauge & differential pressure

-Measuring ranges ±20.68 kPa / ±3 psi / ±83.02 inH2O

-12 selectable scales & units: psi, kgcm2, ozin2, bar, mbar, Pa, kPa, inHg, mmHg, in H2O, FtH2O, cmH2O

-High accuracy ±0.3% FSO @ 25°C in full scale

-Large LCD with backlight

-Zero adjust & offset functions

-MAX/MIN/AVG values with relative time stamps

-Data Hold

-Error codes for out of range indication

-Low battery indication

-Auto power off (can be disabled)

-2 pairs of tubing included

Specifications

-Display: Large LCD with backlight

-Accuracy: ±0.3% FSO (25°C)

-Resolution: inH2O- 0.01 , cmH2O - 0.1, PSI - 0.001, inHg - 0.1...and others, please refer the manual

-Repeatability: ±0.2% (Max ±0.5% FSO)

-Linearity/Hysteresis: ±0.29% FSO

-Maximum Pressure rating: 50KPa (but not the range of measurement)

-Response Time: 0.5 second typical

-Low Battery Indicator: Yes

-Over Range Indicator: Err.1

-Under Range Indicator: Err.2

-Operating Conditions: 0 to 50°C (32 to 122°F)

-Storage Conditions: -1 to 60°C (14 to 140°F)

-Power Supply: 1 x 9V Battery (not included)

One set included

-1 x Manometer

-2 pairs of tubing

-1 x 1/8" Male NPT x 1/8" Barb Access Fitting

-1 x Soft pouch

-Standard Factory Package

- Physical Dimension: 154 x 70 x 32mm

- Weight: 200g

• Large LCD with backlight to measure gauge & differential pressure with twp probes
• Measuring ranges ±20.68 kPa / ±3 psi / ±83.02 inH2O with high accuracy ±0.3% in full scale
• 12 selectable scales & units: psi, kgcm2, ozin2, bar, mbar, Pa, kPa, inHg, mmHg, in H2O, FtH2O, cmH2O
• Zero adjust & offset functions; Data Hold; Error codes for out of range indication
• MAX/MIN/AVG values with relative time stamps; Low power indication; Auto power off (can be disabled)

Product description

The SDMN5 is a portable, rugged dual-port manometer designed especially for HVAC/R field service technicians. Measures gas pressure, static pressure and pressure differential. The SDMN5 includes a zero adjust button of the face of the meter, a rugged rubber boot, a magnet on the back for hanging the meter during service, and the Auto Power-Off (APO) function conserves battery life. The SDMN5 measures pressure between -60inWC and 60inWC (Inches of water column) and -150.0 to 150.0 mBar. The SDMN5 also measures P1 or P2 pressure readings and calculates the difference between P1 and P2. Take static pressure measurements using the resolution mode of 0.01inWC or 0.01mBar. Includes 3/16” to 5/16” adapter for measuring gas inlet and outlet pressures.

• Dual-Port Manomete
• 2 3/16-Inch tubes with brass fittings.Measure duct pressures to balance air flow.-60.0" WC to 60.0" WC range
• 2 3/16-Inch to 5/16-Inch tube adapters - RMA316. Resolution down to 0.01" WC for static pressure measurement
• 9-Volt battery (installed)
• Operator's manual

User questions & answers

Question:	Could this be used to do zone pressure testing? Home Diagnosis tv show discusses the benefits of having matching pressure inside/outside the house
Answer:	It will only work on the return and supply duct if that is the question you are asking. So you will equalized pressure on your unit. Same amount of air coming in as going out. So nothing for outside the house with pressure.
Question:	Does it come with a pouch to keep it in
Answer:	I purchased this fieldpiece a couple of years ago and it did not come with a case or pouch. Very good pressure measuring instrument.
Question:	I need to measure a air chamber that will be between 1/2"-2" water column. it needs to be at 1.250" will this be accurate enough to measure
Answer:	spec states measure to 0.01 inches WC. if you need to 0.001inches WC will not be good for your measurements.
Question:	Full range? -wc to +wc
Answer:	Yes, it's spec'd at: * -60.0" WC to 60.0" WC range

Product description

The SDMN6 dual-port manometer measures gas and static pressure and also accurately tests pressure switches by simulating a draft with an internal pump. A pressure switch is a safety device that prevents the furnace from running in an unsafe manner. The SDMN6 tests the pressure switch to determine if it is working properly, or if it is starting to fail which can cause the furnace to run in an unsafe manner. Plus, with the SDMN6 you can easily calibrate any adjustable pressure switch to manufacturers' specification, so there's no need to carry a large variety of pressure switches on your truck.



The Dual Port Manometer has the ranges to measure gas pressure and the resolution needed to measure static pressure. Ideal for HVACR field service technicians, the SDMN6 can determine if the gas pressure coming into the house or out of the regulator are correct. The SDMN6 measures gas pressure up to 60" water column (WC) with a resolution of 0.1" WC. In addition, the unit measures both positive and negative pressure, which is used for measurement on vacuum control lines. The unit will take differential pressure readings and display the difference between P1 and P2 at all times in the lower right corner of the easy-to-read LCD. Four different measurement scales can be used: inches of water column, millimeters of water column, mBar, and PSI.

• Measures gas pressure, static pressure and differential
• Use to test and adjust pressure switches
• Features include a backlit dual display, zero adjust button, rugged rubber boot, magnetic hanger and auto power off
• Includes: 2 static pressure probes, 2 slide on gas adapters, quick connect leads, 3 hoses and Y-splitter and pump bleed accessory

User questions & answers

Question:	Are the hoses and fittings sold seperately
Answer:	"......Features include a backlit dual display, zero adjust button, rugged rubber boot, magnetic hanger and auto power off Includes: 2 static pressure probes, 2 slide on gas adapters, quick connect leads, 3 hoses and Y-splitter and pump bleed accessory......."
Question:	If i buy this used will warranty be void
Answer:	Don't all you need to call the manufacturer
Question:	Does it come with a 4 pocket case
Answer:	Mine came with a case. Not sure if it has 4 pockets.
Question:	Can this device used to measure blowby pressure on trucks
Answer:	It can only handle low pressures. Its designed for measurements generally below 1 psi.

• SMART DUAL INPUT – RISEPRO® manometer can easily measure the differential pressure with its dual input probes.
• RANGE & RESOLUTION – Measures +/- 2.000psi (0.001 resolution) with accuracy +/-0.3% in full scale
• MAX PRESSURE – 10psi (Can resist up to 10psi but may not show readings when over 2psi)
• 11 SELECTABLE MEASURE UNITS – InH2O, Psi, Mbar, kPa, inHg, mmHg, ozin2, FtH2O, cmH2O, KGCM2, Bar
• BACKLIT, DATA HOLD, AUTO OFF – Tailor-made with all of these useful features for your work requirements!

User questions & answers

Question:	What is the max PSI
Answer:	2psi
Question:	Can this measure inches water column? for gas valves and pressure switches
Answer:	Yes It measures in a couple of different measurements
Question:	When setting this meter to read for gas supply pressure, i want to get results in inches of wc (water column). what's the setting for this meter
Answer:	This is exactly why I purchased this meter. Hit the units button until the units are shown as In. (Inches are abbreviated in). Also make sure you are in differential mode (the diff button) so that the inlet attached to the gas is compared to the inlet exposed to the atmospheric pressure.
Question:	Will it measure in tenths of an inch
Answer:	It will measure .01” of H2O

Product features

Product Features:

• Gauge & differential pressure
• Measuring ranges ±13.79 kPa / ±2 psi / ±55.4 H2O
• 11 selectable scales & units: InH2O, Psi, Mbar, kPa, inHg, mmHg, ozin2, FtH2O, cmH2O, KGCM2, Bar
• High accuracy +/- 0.3% in full scale
• Large LCD with backlight
• Zero adjust & offset functions
• MAX/MIN/AVG values with relative time stamps
• Data Hold
• Error codes for out of range indication
• Auto power off (can be disabled)

WIDE APPLICATIONS

One set included

• 1 x Manometer
• 2 pairs of tubing
• 1 x 1/8” MPT x 1/8” Barb Access Fitting
• 1 x Instruction Manual
• 1 x Carrying pouch

Product description

"Always ready for your pressure measurement needs - the testo 510 differential manometer Achieve rapid and precise measurements at any job site with the testo 510 pressure meter. The compact HVAC/R tool accurately measures total external static pressure, differential pressure, duct velocities and manifold pressure on air conditioning systems and ventilation ducts. Combined with an optional pitot tube, the dual-port manometer also measures airflow. Its diverse range of units allows for particularly versatile measurements. Choose between hPa, mbar, PA mmH2O, INHg, mmHg, psi, m/s and fpm and achieve precise and dependable data. The intuitive design, backlit display and practical accessories, such as the belt pouch and wrist strap provide a quick and convenient application. Technical Data: Differential pressure measuring range: 0 to 40 InH₂O / 0 to 100 hPa Differential pressure measurement accuracy: ±0.01 InH₂O (0 to 0.12 InH₂O) / ±0.03 hPa (0 to 0.30 hPa); ±0.02 InH₂O (0.12 to 0.40 InH₂O) / ±0.05 hPa (0.31 to 1.00 hPa); ±(0.0 InH₂O + 1.5 % of mv) (0.40 to 40 InH₂O) / ±(0.1 hPa + 1.5 % of mv) (1.01 to 100 hPa) Dimensions: 5 x 2 x 1 in. / 119 x 46 x 25 mm Protection class: IP40 Selectable units: hPa, mbar, PA mmH2O, INHg, mmHg, psi, m/s and fpm Maximal static pressure: 7.252 psi / 500 mbar Measuring rate: 0.5 seconds Battery type: 2 x AAA batteries Battery life: 50 h (average, without display illumination) Weight: 3 oz. (with batteries and protective cap) / 90 g (with batteries and protective cap) Scope of Delivery: ✓ testo 510 including batteries ✓ Belt pouch ✓ 2 x hoses ✓ Wrist strap ✓ Certificate of conformity"

• Versatile: The testo 510 measures differential pressure, total external static pressure, manifold pressure and duct velocities, making it ideal for HVAC/R field servicing technicians
• Precise measurements: Thanks to the temperature and air density compensated pressure sensor, the air pressure meter delivers accurate data for ten different measurement units
• Always ready: The backlist display, in conjunction with its intuitive design and magnets on the back, allow for a convenient application of the compact digital pressure gauge
• Durable: Equipped with a particularly rugged housing, including a protective cap and a battery life of 50 hours, the gas pressure meter offers a reliable performance
• Easy operation: The compact, lightweight pressure measurement device comes with a belt pouch, two hoses and a wrist strap and thus can easily be taken to any job site

User questions & answers

Question:	Does this measure inWC
Answer:	Thank you for posting a question, nannio Eye has 1/4 thread hole built-in at the bottom for easy tripod hook-up. If the magnetic base is lost, you may consider using a baby monitor mount instead. Here are some of the monitor mount for your reference. ASIN: B07XCZF2LS , B081N6SPSG, B07M77K2L2 V-LAB

Product features

The testo 510: The pocket-sized differential pressure measuring instrument

Quickly and accurately measure differential pressures on air conditioning systems and ventilation ducts with the testo 510 digital manometer. The testo 510 can measure total external static pressure, differential pressure, duct velocities, manifold pressures, along with air flow with the addition of an optional pitot tube.

Lightweight and Convenient

At only 3oz. (90g) including the protective cap and batteries, the pocket-sized testo 510 can be taken to any job site. The bright, backlit display allows for easy viewing in any environment, while the magnets on the rear allow for hands-free readings.

Diverse Range of Units

The compact testo 510 is suitable for any differental pressure job with the option of 10 different units of measurement: hPa, mbar, Pa, mmH2O, inH₂O, inHg, mmHg, psi, m/s, fpm

Technical Specifications

Differential Pressure

• Measuring range: 0 to 40 InH₂O / 0 to 100 hPa
• Accuracy:
  • ±0.01 InH₂O (0 to 0.12 InH₂O)
  • ±0.03 hPa (0 to 0.30 hPa)
  • ±0.02 InH₂O (0.12 to 0.40 InH₂O)
  • ±0.05 hPa (0.31 to 1.00 hPa)
  • ±(0.0 InH₂O + 1.5 % of mv) (0.40 to 40 InH₂O)
  • ±(0.1 hPa + 1.5 % of mv) (1.01 to 100 hPa)
• Resolution: 0.00 InH₂O / 0.01 hPa

• This Manometer can measure the air pressure of the single pipe， or differential pressure of two pipes.it is suitable for measuring of ventilation and air condition systems,and widely use forgas measurement,calibration,and any trouble shooting of any gas pressure systems.
• Ultra-low-power sensing & measurement with 32-bit MCU and 24-bit ADC make the measurement of air press faster and more accurately.Perfect for working on tankless heaters,Very handy to set gas pressures on electric valves,Using for service testing of gas pressure on domestic boilers, Measures Air Flow about your bathroom fan ect.
• Selectable pressure range: ±2.999psi; Accuracy: ±0.3%FSO (at 25°C) ; Repeatability: ±0.2% (Max ±0.5%FSO); Linearity/Hysteresis: ±0.29%FSO.
• 12 Selectable Units of Measure (kPa, Psi, Kgfcm2, Ozin2, Bar, mbar, inHg, mmHg, InH2O, FtH2O, cmH2O, Pa) with function: Data Hold and Error Code - Response Time: 0.5 Sec.
• Ehdis digital manometer has Dual Input that can test / measure the differential gas pressure with its provided twin input probes.Max / minimum record function; Data save function, also has room temperature future.

User questions & answers

Question:	I want to make measurements at distances greater than those with the supplied tubing. What diameter silicone tubing fits these connectors
Answer:	Hi, please choose the silicone tube of 0.5mm outer diameter, 0.3mm inner diameter, 0.1mm thickness. Thank you.
Question:	What’s the max gas pressure
Answer:	Hi, please kindly know the preesure range of this product is ±20.68kpa, resolution 0.001. Thank you.
Question:	Can this be used to measure crankcase pressure on a gasoline engine
Answer:	Hi, please know normally the pressure inside of the vehicle is over 70－100kpa, which has been over the measurement range of this item. So we do not recommend to used this product to measure crankcase pressure on a gasoline engine. Thank you.
Question:	Can you use this to check water column on propane regulators ,.....10 to 12 inches of water column
Answer:	I really think so you have to check in the manual.

Product features

Digital Manometer Gas Pressure Tester

• This Manometer can measure the air pressure of the single pipe or differential pressure of two pipes.it is suitable for measuring of ventilation and air condition systems,and widely use forgas measurement,calibration,and any trouble shooting of any gas pressure systems.
• Ultra-low-power sensing & measurement with 32-bit MCU and 24-bit ADC make the measurement of air press faster and more accurately.Perfect for working on tankless heaters,Very handy to set gas pressures on electric valves,Using for service testing of gas pressure on domestic boilers, Measures Air Flow about your bathroom fan ect.

Manometer Specifications and Parameters

• Selectable pressure range: ±2.999psi
• Accuracy: ±0.3%FSO (at 25°C)
• Repeatability: ±0.2% (Max ±0.5%FSO)
• Linearity/Hysteresis: ±0.29%FSO
• Response Time: 0.5 Seconds
• Over Range Indicator: Err 0
• Under Range Indicator: Err 1
• Operating Conditions:0 to 50°C (32 to 122°F)
• Storage Conditions: -10 to 60°C (14 to 140°F)
• Battery:4.5V(3*1.5V/AAA) NOT included batteries

Package included

• 1 x Manometer
• 1 x English User Manual
• 1 x Protector Bag
• 1 x Metal connector
• 2 x Rubber tube

Product description

The Testo 510I SMART probe is a Wireless differential pressure probe used for accurate low-pressure measurements. The Testo 510I is great for measuring pressure in manifolds, static pressure, and pressure drops in buildings or ventilation systems. Use it to measure the pressure drop across coils and filters or in ducts and systems. made in United States. Manufactured by Testo, Inc.

• Differential pressure (manometer) measures static pressure, air flow, and volume flow (with pitot tube not incl.)
• Measures manifold pressure and pressure drop across filters and coils and has measurement menu in app that includes pressure drop alarms
• Easy configuration and calculations for volume flow (enter pitot tube factor and dimensions easily)
• Magnetic back holds instrument for hands-free operation

User questions & answers

Question:	Does it come with the test probes
Answer:	Yes it has one pre-installed
Question:	Does this measure inches in W.C
Answer:	Yes it need to be plugged in for power
Question:	Can tgis be used for natural gas
Answer:	Support onvif
Question:	To measure the static pressure in a duct sytem, I need to buy the pitot tube
Answer:	No WiFi needed.

• Dual input Differential measurement up to 80.27 inches of water column within range
• Measures in 11 scales; inh2o, PSI, bar, mbar, kpa, inhg, mmhg, oz in, fth2o, cmh2o and kgcm
• Magnetic mount, backlit display, and Zero button
• Auto ranging and data hold
• Max/min

Product description

Differential Pressure Manometer measures to 29psi and displays results in 8 units of measure. Features include: zero function for offset measurements, Min/Max, Data Hold, Auto power off, and a built-in RS232 interface with optional Data Acquisition software or Datalogger. Includes 2 quick-disconnect fittings, 9V battery, protective holster with stand, and case.

• Wide-range (0 to 29psi) Gauge/Differential pressure meter with 8 selectable units of measure
• ±29psi with 0.02psi resolution
• 8 selectable units of measure
• Zero function for offset measurements
• Data hold, auto power off, and min/max functions

User questions & answers

Question:	Can you use to set natural gas regulators fro 2psi to 25psi
Answer:	Yes, the camera does record and you can play back. You need to use the app and your mobile phone. Video will be uploaded to your video files.

• Measures air pressure of the single pipe or differential pressure of 2 pipes. Has 11 selectable units of measurement kPa, psi, kgfcm2, ozin2, bar, mbar, inHg, mmHg, inH2O, ftH2O, cmH2O.
• Best for measuring the ventilation and air condition systems. Widely used for gas measurement, calibration, and any troubleshooting of any gas pressure systems.
• Max / minimum / Average reading record function
• Low battery display and Auto power off set up function
• Differential pressure measurement,Large LCD backlit dual display

User questions & answers

Question:	What are the thread size on the fitting accessory
Answer:	The threaded barbed nipple is 1/8" pipe thread
Question:	Can i measure the flue gas flow rate from a 4 inch round exhaust duct in pascals, and/or cfms and/or air speed
Answer:	Yes, if you set an orifice in your duct ,or refer to some reference table. This gauge measures only pressure drop.
Question:	What are the lengths of the plastic tubings that come with this product
Answer:	The length of the tube comes with the product is 7 inches / 18cm
Question:	What is the barb size for the tubing
Answer:	3/16" and a 5/16" barb is included too. I have had go luck with this unit. For the money it's well worth it.

Product features

Digital Handheld Manometer HVAC Air Vacuum/Gas Differential Pressure Gauge Meter Tester 11 Units

Product description

Features -Gauge & differential pressure -Measuring ranges 13. 79 kPa / 2 psi / 55. 4 H2O -11 selectable scales & units: inH2O, psi, bar, mbar, kPa, inHg, mmHg, ozin2, FtH2O, cmH2O, kgcm2 -High accuracy 0. 3% in full scale -Large LCD with backlight -Zero adjust & offset functions -MAX/MIN/AVG values with relative time stamps -Data Hold -Error codes for out of range indication -Low battery indication -Auto power off (can be disabled) -2 pairs of tubing included Specifications -Display: Large LCD with backlight -Accuracy: 0. 3% FSO (25°C) -Resolution: inH2O- 0. 01 , cmH2O - 0. 1, PSI - 0. 001, inHg - 0. 1. . . and others, please refer the manual -Repeatability: 0. 2% (Max 0. 5% FSO) -Linearity/Hysteresis: 0. 29% FSO -Maximum Pressure rating: 10 psi (but not the range of measurement) -Response Time: 0. 5 second typical -Low Battery Indicator: Yes -Over Range Indicator: Err. 1 -Under Range Indicator: Err. 2 -Operating Conditions: 0 to 55°C (32 to 122°F) -Storage Conditions: -1 to 60°C (14 to 140°F) -Power Supply: 1 x 9V Battery (not included) One set included -1 x Manometer -2 pairs of tubing -1 x 3/8" NPT x 1/8" Barb Access Fitting -1 x Soft pouch -1 x Instruction Manual -Standard Factory Package

• Large LCD with backlight to measure gauge & differential pressure
• Measuring ranges ±13.79 kPa / ±2 psi / ±55.4 H2O with high accuracy ±0.3% in full scale
• 11 selectable scales & units: inH2O, psi, bar, mbar, kPa, inHg, mmHg, ozin2, FtH2O, cmH2O, kgcm2
• Zero adjust & offset functions; Data Hold; Error codes for out of range indication
• MAX/MIN/AVG values with relative time stamps; Low power indication; Auto power off (can be disabled)

User questions & answers

Question:	Can this be used for measuring pressure differential between lower and upper engine cowlings in light piston aircraft
Answer:	That depends on the pressure the switch on your furnace is operated at. This manometer measures very low pressure, most pressure is measured in lbs per sq in or PSI, gas pressure feeding into a furnace is very low ( below 1 psi) gas pressure in your home is measured in inches of water , think of counting dollars and needing to get closer to less than a dollar think of pennes 100 make a 1 dollar, same thing in less than 1 psi you have to switch to inches of water
Question:	can this be used or gas pressure
Answer:	Yes set on inches of water 11- 14 adjust propane regulator only
Question:	when using the left port, do you get a negative reading? mine does so I not sure if I got a defective unit
Answer:	If you are referring to the barbed adapter, it should be a 1/4" npt. You may need a bushing to size it to whatever outlet you are measuring. The two ports are used for differential pressures such as measuring air pressure drop through an air handler/furnace, etc. mWhen you are easuring gas pressure, one port stays open to read atmospheric pressure while the other (port) is reading inHg, KPa, bar, etc.
Question:	How long are the tubes
Answer:	No, the description shows 2 psi maximum. Your water system should be MUCH higher than this. The 55 water range is in inches of water column. It’s a completely different scale than psi. 55 WC (water column) is about 2 psi.

Product description

Specification:

This manometer can be used to help you carry out quick and easy filter checks when performing differential pressure checks on ventilation and air conditioning systems.

Differential pressure measurements are carried out to determine whether filters still work properly or whether they are used up and clogged and need to be replaced.

Measuring Range: ±20.68 kPa / ±2.999 psi

Accuracy: ±0.3% FSO (at 25 OC)

Repeatability: ±0.2% (MAX±0.5%FSO)

Linearity / Hysteresis: ±0.29%FSO

Response Time: 0.5Seconds

Over Range Indicate

Memory data store (100 datas)

Battery type: 6F22/9V (not include)

Package include:

1x manometer

2x Soft Tubes

1x manometer protective bag

1x Barb access fitting

1x instruction Manual

• Large LCD Display And Prevent Eyes weariness: You can read all kinds of parameter clearly , the Design of Display light can protect your eyes
• Manometer Protective bag: It include a Bag that can Keep well
• Hanging Hole: Convenient for you when working
• Product Instruction Manual: This can guide you to use the manometer
• Multifunction in Work: It is suitable for measuring of ventilation and air condition systems, gas pressure and so on

User questions & answers

Question:	does this meter do natural gas pressures at the gas valve and can you zero it out
Answer:	yes,