14 best fluval hydrometers

Product description

Fluval Sea Hydrometer provides an accurate and convenient method of measuring specific gravity and salt level in marine aquariums. Regular testing is strongly recommended as stable salinity levels are essential for the health of marine fish and invertebrates. Compact and easy to use, the hydrometer can be permanently installed inside the tank for continuous readings. Its slim, low-profile design camouflages well inside the tank and will not diminish the aesthetics of the aquarium. It can also be used as a portable device, allowing you to take samples simply by submerging it in the water. The Fluval Sea Hydrometer features large, easy-to-read markings with ideal salinity range clearly marked in green for clarity.

• Helps measure specific gravity and salt level in marine aquariums
• Features large, easy to read markings
• Simple design-blends in easily
• Item Package Weight: 0.185

Product description

Cora life's Hydrometer takes a true water sample at six inch depth. Easy to read and accurate, this specific gravity meter is designed to give temperature-corrected readings in warm water aquariums. Includes a self-leveling, hanging device and allows your hands to stay dry, avoiding contamination of aquarium.

• Included components: All Components included in Picture and Description
• Cora life is one of the markets leading manufacturers of premium aquarium products
• Cora life's Hydrometer takes a true water sample at six inch depth
• Easy to read and accurate, this specific gravity meter is designed to give temperature-corrected readings in warm water aquariums
• Coralife is one of the market’s leading manufacturers of premium aquarium products
• Coralife's Hydrometer takes a true water sample at six inch depth

User questions & answers

Question:	It says "fill with salty water and allow it to sit for 24 hrs". anyone following that and find it helpful? my new one is off
Answer:	I purchased mine for testing the spoil pH and watering needs and they both seem to be very accurate. I do not know how accurate it is for light testing. I do not know what your application is for, but if it's to see how much light is present for growing a garden, then you need a minimum of 6 hrs of sunlight a day, preferably 8. Of course it also depends on what you are trying to grow, some plants need much more than others.
Question:	Can it be left inside the aquarium for continuous readings
Answer:	Since soil most often is in/close to neutral state (with pH value of 7), when you use it to test the pH value of soil, it is highly likely that you find the needle in display window stay still (because the default pH value is set at somewhere between 7 and 8) . The needle will not swing substantially unless the meter in soil with strong acidity or alkalinity. Customers sometimes are misled by this appearance and hence regard the tester as a defective unit by mistake. Here are the steps of How To Use this soil meter: Step 1: Gently wiped the probes all the way up and down with dry cloth a few times before use Step 2: Push the switch to MOIST or PH or LIGHT position Step 3: Stick the probes into the soil 4-6 inches (2/3 of the probes) or more deep Step 4: Adjust the position of the probe until the pointer on the dial swing slightly Step 5: Note moisture/pH/light level in the dial Step 6: Remove probes from soil and wipe clean with dry cloth after each use Tips: This soil meter is designed to measure moisture and ph level of soil, so it CAN ONLY be used in soil, it CANNOT be used to test any liquids, such as pure water, lemon juice, vinegar and so on, or the probes may be damaged.
Question:	I want this to test my fresh water aquarium i fill with softener water. Will it work
Answer:	Yes there is a small piece of sponge material in the cap that you can apply storage solution whenever you plan to leave the cap on. I recommend that if you will be using your pen daily, you get a small glass cup ( the 100ml measuring cups work ideal) and keep storage solution in this cup and keep pen placed in this as opposed to removing and replacing cap continuously. I generally mix 20ml of storage solution with 30ml of distilled water to keep in cup for pen.
Question:	Does this work with swimming pools
Answer:	These are great pens for the hobbyist just remember when you do not see the check mark on your pH pen or on your PPM EC conductivity bluelab pen it is time to calibrate if you do not see this check mark displayed on either pin on the screen calibrate. I also recommend using the 7.0 bluelab calibration solution followed up by the 4.0 bluelab calibration solution to get a more accurate reading of the pH solution. Also use blue lab calibration solution for your conductivity meter as well these meters will last a very long time I had mine for almost 4 years and still in good shape keep your meters clean keep your pH bulb moist in store in the pH storage solution that is made by blue lab. Never let the bulb go dry if you do it will take 24 hours or it is good to give 24 hours to rehydrate your pH bulb. And if I'm not mistaken on the bottles the calibration solution of either your conductivity meter solution for calibration or your pH pen calibration solution it says on the bottle after opening don't use after three months I don't know if this matters a whole lot or not but I've used my solution over three months plenty of time and no noticeable difference in this. I guess the main thing is to keep your pH pen glass bulb hydrated I believe that this is probably the most important thing when owning a blue lab pH testing pin. If there is anyone to add to this conversation or to give me any advice that's positive please do so I am always willing to learn and listen so please if anyone has any experience with these pins other than me and something that I may not have mentioned or know please tell me or leave a review thank you I hope this has been helpful. And please stay positive with positive feedback just remember people there are no stupid questions and no mistakes only lessons thank you.

Product features

Coralife Energy Savers ACLAF877 Deep Six Hydrometer

The re-designed deep six hydrometer with improved calibration and bubble diffuser ensures more accurate readings of your aquarium salt levels. Also includes a built in base so you can rest the hydrometer on a counter top or other flat surface when taking salt readings.

Features:

• Specific Gravity and Salinity PPT Scales
• Optimal Specific Gravity / Salinity range indicator on scale
• Bubble diffuser on water intake prevents micro-bubbles from forming on needle

• Measure salt water or salinity of water, ideal for aquariums and marine monitoring.
• Measures on 2 scales, Specific Gravity (D 20/20) and parts per thousand.
• Features automatic temperature compensation.
• Comes with hard case, dropper, screwdriver, user manual and cleaning cloth.
• The main part is made of chromium, it's very durable.

User questions & answers

Question:	will this work to test slightly brackish water for a livebearer aquarium
Answer:	Unsure about brackish water. It works fine e in saltwater aquariums with a specific gravity of 1.025. It tests between 1.000 and 1.040
Question:	Hi, i bought a calibrating fluid and calibrated my refractometer to sg 1.026 but when i test it on distilled water it reads 1.010. why is that
Answer:	I always test with RODI water
Question:	I want to test the brackish canal water to see if i can use it for irrigation. will this tester work? I was told to check the salinity of the canal
Answer:	Yes, brackish water ranges between 0. 05 to 30 PPT
Question:	Is this any use for hydroponics
Answer:	It is used for testing the salt water fish tank.

Product features

Salinity refractometer 0~100 PPT

Dual Scale

Specific Gravity and PPT. With this refractometer you can get the result in two different units at the same time in just one test.

ATC Function

This refractometer is equipped with automatic temperature compensation function, minimize the impact of temperature on accuracy.

Include

Comes with every thing you need: a hard case, droppers, a screwdriver, a user manual and a cleaning cloth.

The Scale Range

The scale range of this refractometer is 0~100‰ ( 1‰=1 PPT=1000PPM, PPT means"parts per thousand", PPM means"parts per million"), it also shows the corresponding specific gravity range 1.000 to 1.070. These are the most common units to show salinity of water. With this refractometer you can get the result in two different ways at the same time in just one test.

The min reading resolution is 1 ‰, this make it possible to mearsure low concentrated salt solutions.

For Marine Monitoring

For most sea, the salinty is between 30‰~35‰. So this refractometer is ideal for simple marine monitoring and research.

For Aquariums Water Monitoring

Ideal for aquariums or marine fishkeeping amateurs, cause they just need to make the salinity of water similar to the sea water.

For Swimming Pool Water Measuring

If you use a salt chlorine machine to disinfect your pool, you should make sure the salinity right first, normally the salinity should be between 3‰~7‰, this refractometer can help.

For Lab or Indurstry Purposes

Ideal for lab and indurstry use for testing salinity solution in the range of 0~100‰.

Is it complex to use a refractometer?

1. Calibration: Place a few drops of distilled water on the prism and use the screwdriver to adjust the calibration screw untill the reading is"0".
2. Measuring: Place a few drops of solutions you want to test on the prism and look into the eye piece, you will get the reading.

Note: The user manual will show you the details about how to use the instrument exactly, it very easy to use even for new users.

Product description

Aquarium Systems - IO INSTANT OCEAN HYDROMETER. Instant Ocean

• No-wet-hands-design

Product description

Coralife BioCube Mini Hydrometer can remain submerged inside the aquarium for continuous monitoring of salt levels. Compact design allows for discreet placement and will not detract from the natural beauty of your reef or saltwater aqua scape Can be used in large or small saltwater aquariums and sumps.

• Can remain submerged inside your aquarium or sump
• Know your salinity in a glance
• Compact design allows for discreet placement in the aquarium
• Ideal for all saltwater aquariums and sumps

Product description

Feature:



100% brand new and high quality.



1.Safe Material:Made of plastic,aquarium clear automatic accurate readable saltWater hydrometer,easy to used,easy to read.

2.Small and Waterproof:Accurate, durable, and easy to read your marine aquarium's salt level and specific gravity,small and waterproof.

3.Clearly Safe Zone Indicated:The outside rang of scale indicates salinity(PPT),The inside range of scale indicates gravity,and with safe zone clearly indicated.

4.Wide Usage:Fit for brackish and marine aquariums.Perfect for testing both salinity and specific gravity of your brackish and marine tank.

5.Easy to used:The easy-to-read swing-arm pointer and extra wide stable base provide an accurate test result.

6.Function:Quickly, easily, and accurately measure your marine aquarium's salt level and specific gravity.



Attention

1.Slowly place the hydrometer into the test water. When testing, make sure the test water level reaches the wave scale.

2.If there are air bubbles stuck on the pointer during the product test or while put it into water, use a plastic stick to blow the foam to make the bubble dismissing,to ensure accurate readings.

3.Place the product in the pool or on the horizontal line outside the pool to accurately obtain the test results.

4.After use the hydrometer, it should be cleaned with water,When any salt is on the pointer, the salinometer will not read correctly.Then need to Soak in warm water or vinegar for 30 minutes, then dry it in a cool place.



Shape and size:

Size:(L*W*H)24*14.5*3mm

Weight :0.11kg



Packing list:

1 x Hydrometer.

1 x Stick.



Our product provide one years warranty.



If you have any question,pls feel free contact me at any time,i am 24 hours here waiting for you.

　

• 🐠Safe Material:Made of plastic,aquarium clear Automatic Accurate Readable SaltWater Hydrometer.
• 🐠Durable Clear Acrylic:Accurate, durable, and easy to read your marine aquarium's salt level and specific gravity,Small and waterproof.if the specific gravity between 1.000 - 1.019,show that the specific gravity is small;if the specific gravity between 1.020 - 1.023,show that the specific gravity is nomal;if the specific gravity between 1.024 - 1.030,show that the specific gravity is big;
• 🐠Clearly Safe Zone Indicated:Includes solinity and specific grovity scales.The outside rang of scale indicates salinity(PPT).The inside range of scale indicates gravity.And with safe zone clearly indicated.Range of use: 0-40 degrees (1.000-1.030).If the salinity ppt between 32 - 40，show that the salinity hydrometer is high;If the salinity ppt between 27 - 31，show that the salinity hydrometer is normal; If the salinity ppt between 0 - 26，show that the salinity hydrometer is light.
• 🐠Wide Usage:Fit for brackish and marine aquariums.Perfect for testing both salinity and specific gravity of your brackish and marine tank.Includes solinity and specific grovity scales.Suitable for fresh water and sea water.
• 🐠Easy to Read and Use:The easy-to-read swing-arm pointer and extra wide stable base provide an accurate test result.

• HIGH ACCURACY: Temperature Range: -50℃ ~ +70℃ (-58 °F ~ +158 °F); This aquarium thermometer is accurate to +/- 1℃, no matter whether the probe is placed in any corner of this fish tank, an accurate temperature will be displayed
• LCD DISPLAY: Comes with a large LCD display that is easy to read clearly and accurately
• ADJUSTABLE UNIT TEMPERATURE: Easy to adjust the temp between Fahrenheit and Celsius displays; Long-press the power button to adjust the unit display
• TWO SUCTION CUPS: Equipped with two suction cups, one for attaching the cable to the side of the tank and another for attaching the thermometer
• SUPER LONG CABLE: The cable length connected to the probe is 78.74 inch (2 m) superior to 23.62 inch (60 cm) standard cable length; Allows accurate temperature measurements in even the largest fish tanks

User questions & answers

Question:	Can I get a longer probe?like
Answer:	Direct to phone wifi. That means that you can’t be on the internet at the same time.
Question:	It appears probe is plastic. Can you please confirm? (I need it for use non-metal.) Thank you
Answer:	Not sure. I have a galaxy tab A and it works fine.
Question:	I know the probe is waterproof, but is the thermometer housing waterproof
Answer:	No, it can't. This soil meter is designed to measure moisture or ph level of the soil and sunlight level, so it can only be used in soil, it cannot be used to test any liquids(such as: pure water, vinegar, lemon juice and so on), or the probes may be damaged.
Question:	Can you put probe in saltwater tank
Answer:	Since soil most often is in/close to neutral state (with pH value of 7), when you use it to test the pH value of soil, it is highly likely that you find the needle in display window stay still (because the default pH value is set at somewhere between 7 and 8) . The needle will not swing substantially unless the meter in soil with strong acidity or alkalinity. Customers sometimes are misled by this appearance and hence regard the tester as a defective unit by mistake. Here are the steps of How To Use this soil meter: Step 1: Gently wiped the probes all the way up and down with dry cloth a few times before use Step 2: Push the switch to MOIST or PH or LIGHT position Step 3: Stick the probes into the soil 4-6 inches (2/3 of the probes) or more deep Step 4: Adjust the position of the probe until the pointer on the dial swing slightly Step 5: Note moisture/pH/light level in the dial Step 6: Remove probes from soil and wipe clean with dry cloth after each use Tips: This soil meter is designed to measure moisture and ph level of soil, so it CAN ONLY be used in soil, it CANNOT be used to test any liquids, such as pure water, lemon juice, vinegar and so on, or the probes may be damaged.

Product features

VIVOSUN LCD Digital Thermometer

VIVOSUN's digital aquarium thermometer is designed for monitoring and checking the water temperature of fish tanks. With a large LCD display to help you easily read your measurements and a compact and durable design, you’ll find tons of opportunities to use it. It is a perfect match for your aquarium.

Notice:

1. If you want to turn the device off, please press the power button for 3 seconds.

2. Do not submerge the thermometer into the fish tank.

Large LCD Screen

• Large, easy to read LCD display
• Celsius degrees Fahrenheit freely switch

Durable Battery

Equipped with one LR44 button battery to supply electricity, which is durable and replaceable and can be long-term used

2 Suction cups

One is a fixed thermostat and the other is a fixed probe

Waterproof Probe

Comes with a high-quality probe that works well underwater without corroding or breaking

Product description

Specifically designed for Fluval Spec Aquariums, Fluval Spec Biomax, 1.5 ounces, provides critical stage three biological filtration. Fluval Spec Biomax has a large surface area that provides optimal colonization of beneficial bacteria, which enhances the elimination of fish wastes, resulting in a healthier aquarium environment. The Fluval Spec BioMax has more capacity than most biological filter media and allows ideal water movement throughout the media, to ensure optimal contact time for efficient biological filtration.

• Stage three biological filtration
• Provides optimal colonization of beneficial bacteria
• Helps create a healthy environment for your fish
• Country Of Origin: China

User questions & answers

Question:	Is it possible to cut a third opening in the middle for an additional biomax bag
Answer:	It’s meant for testing the levels of salt in yoUr water. Salt you add. If you are doing straight freshwater you don’t need it.
Question:	How often does the foam filter need to be replaced
Answer:	If it is a salt water pool then it would be fine.
Question:	i have Top Fin filter on my 20 gallon tank , well i really dont know where do i place this carbon
Answer:	It does not capture sound.
Question:	Does this fit the fluval 13.5 gallon evo
Answer:	Wouldn't work with an LG G9 phone , so I sent it back.

Product description

1. Easy to use 2. Green indicators are ideal range of water temperature and specific gravity for most salt water / marine aquariums 3. Hydrometer measures specific gravity 4. Need it for raising brine shrimp

• 1. Easy to use 2. Green indicators are ideal range of water temperature and specific gravity for most salt water / marine aquariums 3. Hydrometer measures specific gravity 4. Need it for raising brine shrimp

Product description

Instant Ocean Hydrometer is accurate, reliable water test equipment is absolutely vital to creating and sustaining a healthy, successful marine environment. Easy to read and simple to operate, the Instant Ocean Hydrometer delivers precise full-range salinity and specific gravity readings - accurate to 0.001 - and does it each time, every time.



Product Features

Accurate to 0-001

Durable, Permanent Needle Mount

Easy-Read, 2-Color Scale with Safe Zone

Extra-Wide Stabilizer Base

Easy Fill convenience -- NO WET HANDS!

• Marine hydrometer: Tests salinity and specific gravity in marine aquariums to help maintain a healthy tank
• Accurate: Precise, full-range readings - accurate to +/- 0
• Ready to use: Simply dunk in aquarium to fill with water, then set on level surface to read
• Easy to read: Clearly marked to show results
• Extra-wide stabilizer base: Two-color scale with a safe zone for simple results

User questions & answers

Question:	How much water is needed to get an accurate reading
Answer:	I don’t know for a fact but I believe its not waterproof since the battery compartment does not appear to be sealed.
Question:	Is there any way to calebrate this thing? plain R/O water is reading
Answer:	I'm not sure. But I believe you can.
Question:	if the hydromete to 1028 what do i do
Answer:	I fill mine and read it instantly and it seemed to work. I never let it sit. That being said, I have graduated to using a refractomer that I bought from bulk reef supply. It is way more accurate and takes 2-3 drops of your sample water and 2 seconds to read it.
Question:	Will this work for a salt water swimming pool
Answer:	No, it cannot. You must pour out the water to the read line in order to get a correct salinity reading.

Product description

Specifications:

Size:app.20cmx1.5cmx8.5cm(Hight x Thick x Width)

Specific gravity range: 1.000-1.027

Salinity range: 0-36



Instructions for use:

Insert the hydrometer below 15 cm of the water tank or fish pond until the water overflows the baffle.

When the water reaches full state, take out the hydrometer and place it on a horizontal surface.

Bubbles attached to the needle can cause inaccurate readings. Carefully tap the hydrometer to vibrate the adhering air bubbles.

Read the specific gravity on the inner scale and read the salinity (PPT) on the outside scale. It is recommended that the seawater of the seafood pool be between 1.020 and 1.023, which is within the safety line.



Cleaning and maintenance:

Before the first use of hydrometer, it is recommended that the first filled with water to make it stand for 12 hours, so that the pointer easier go into work status.

After each use, wash with water.

Salt crystallization in pointer will lead to inaccurate readings, if salt crystallization in the hydrometer, the hydrometer is soaked in lukewarm water or vinegar for 30 minutes, then rinse it dry.



Note:

Manual measurement, with small error. Please check size in detail before purchase.

Real colors may slightly differ from the pictures, as it depends on specific monitor settings and light brightness.



We highly appreciate all customers opinions to improve the selling, also if anything you unsatisfied, please contact us for probable best solution.



Package Includes: 1Pcs

• Made of high quality plastic, Withstand voltage,high transparency.
• Special for culture of marine fish, the specific gravity and salinity of seawater are displayed once, easy to use and easy to read.
• Keeping your hands clean,go underwater 15 cm (6 inch) depth to avoid errors caused by inhalation of oil film on the top of water.
• When the water reaches full state (with the top of the baffle level), filed a hydrometer, this product can be hand or hang in the cylinder, automatic level function, can automatically find out the level to avoid the error.
• Proper salinity level is one of the most important factors in the health of the fish.Readable and accuracy can up to ± 0.002 gravity unit.

Product description

The Fluvial Submersible Digital Thermometer is a digital aquarium thermometer for both fresh and saltwater aquariums. IT helps measure the temperature of your aquarium quickly and efficiently.

• Features a large LED display
• Fully submersible thermometer
• Large screen for easy reading
• Country Of Origin: China

User questions & answers

Question:	What type of warranty is on this product
Answer:	The top fin filter cartridge product page says the design allows for addition of extra carbon or other filter media. I haven't replaced mine yet, so I don't know what this means. I guess you can add media to the cartridge by cutting a slit at the top. There is room for two of these cartridges. So I'm not sure if they are advertising that the carbon can be added to or replaced. I intend to replace the carbon every 4-6 weeks and keep the cartridge until it falls apart. To answer your question, I would replace the carbon with the same amount or more if it will fit in the cartridge.
Question:	is in F o C
Answer:	I use it with a 9 gallon fluval tank. It works.
Question:	Does anyone know the model # for a replacement battery
Answer:	Yes
Question:	What battery does it use
Answer:	It appears to be plastic. Could possibly be plastic coated metal.

Product description

Automatic Temperature Compensation Salt Salinity Refractometer - Dual Scale 0% - 10% & 1.0 to 1.070 S.G. Dual Scale Hydrometer. Designed for the safety transportation purpose, the very 1st open of the product case might be tight. Refractometer for seawater, reef aquarium, kitchen use etc. 0-100 ppt : Our optical refractometer has scales ranged from 0 - 100 ppt (0 - 10 %). The reading resolution is 1 ppt. It is designed for the measurement of seawater (marine aquaria) or very low concentrated salt solutions. The second scale is for reading of the salt solution density ranged from 1.000 to 1.070 g/cm3 (resolution 0.001 g/cm3). For Reference of solutions: 1.Fresh water < 0.5 ppt 2.Brackish water -- 0.5 to 30 ppt 3.Seawater -- 30 to 50 ppt 4.Brine -- 50 ppt Measurement: Easy Use! Place a few drops of the liquid on the optical part of the refractometer, cover the prism, and the liquid will spread more easily over the prism, look throught the eyepiece against the light and you will be able to read the result value on the scale. 10℃~30℃ / 50F ~ 86 F. For temperature beyond this range, please calibrate before use. Content and equipment: a firm plastic case 1x refractometer 1x cleaning cloth 1x suction tube 1x screw driver 1x operating instructions

Product description

The new Kent marine hydrometer makes measuring aquarium water salinity simple. Its precision and compact design provides accurate readings that aquarists of any level can understand. Accuracy to 0.001 specific gravity units.

• Large numeric display includes sweet spot for marine and reef aquariums
• Water is gently diverted to bottom, reducing air bubbles from forming
• Designed to give temperature-corrected readings in warm water aquariums(68-degree to 85-degree F/ 20-degree to 30-degree C)
• An easy way to gauge Aquarium salinity at a glance
• Easy to read