Top 8 Best Aquarium Hydrometers

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✔【AUTOMATIC TEMPERATURE COMPENSATION】Automatic temperature compensation built into the salinity refractometer allows it to obtain consistently accurate readings, eliminating the need to deliberately control the liquid temperature, just make sure it's at room temperature.
✔【ATC function】automatic temperature compensation of seawater salinity refractometer, making it easier and faster for you to get accurate readings. Measurement range: 0 to 10% salinity, accuracy: 0.01% scale.

✔[ FULL KIT ]: 1 x Storage Case with Inner Protective Tray, 1 x Salinity Refractometer, 1 x Mini Screwdriver, 1 x Cloth, 1 x Pipette, 1 x Instruction Manual.
✔[ EASY TO USE ]: Place 2 drops sample on the main Prism and close the panel and hold the refractometer up to the light and look through the eyepiece.
✔[ MEASUREMENT RANGE ]: 0 to 10% salinity, 0.01% Study accuracy.

✔This refracto meter can be used to measure the salinity levels of saltwater aquariums and the worlds oceans.
✔Professional Refractometer with ATC, easy operation and save big: just need 2 3 drops of solution, you can get accurate readings.
✔Package included: a refractometer,a screw driver,a suction tube,a firm plastic case.

✔Versatile and Reliable: This salinity refractometer tester is widely used for measuring salinity of water, saltwater, and other related solutions, making it an ideal tool for aquariums, marine monitoring, fish-keeping, agriculture, and saltwater pools. Its reliability, accuracy, and convenience make it a must-have for any aquatic hobbyist or professional.
✔Easy Operation:Drip 2-3 drops of water onto the prism.Calibrate using the Mini-screwdriver to "0".Wipe the prism with the cleaning cloth.Add 2-3 drops of the sample.Wait 30 seconds for accurate readings.Align with light and adjust the focusing ring for clear scale lines.

✔[amz_corss_sell asin="B00XAFBXYO"]

✔Perfect for salty water tank and aquarium, seafood water tank, salty pools & spas and etc
✔Minimum scale: salinity: 1 ‰, Specific Gravity : 0.001
✔Automatic Temperature Compensation: 10℃~30℃

✔Easy to Use- Just dip electrode into the saltwater pool/ fish tanks or take a cup of sample for measurement, then the salt level results will probably be display at the LCD backlight screen. Compared with refractometer and salt test strips, the measurement results may also be observed more conveniently.
✔Range- ORAPXI tester with a range from 0~9999 ppm/ 10-100 ppt, not only suitable for saltwater pool& spas, koi fish pond, salt water fish tank, but also works for sea fish, marine aquaculture, marine fishkeeping aquarium, agricultural, and so forth.

✔【Multifunctional and Convenient】The CIZTADA tester can test salinity, TDS, EC and temperature in an accurate, fast and reliable manner. Get all data on the APP on the same time, and simplifies the complicated measurement steps.
✔【One-click Data Storage and Sharing】Save all of the measurement data with one click, share the data with others, and connect to a printer to print the data. Make the testing work toward more efficient.