Refractometer, Portable Salinity Aquarium Water Meter 0 to 10%, ATC Hydrometer

Easy to use and calibrate Automatic temperature compensation (ATC) 10~30℃, increase accuracy and eliminate temperature worries Adjustable focus and clearly defined scale with large, easy-to-read measurements Padded with soft and comfortable non-slip rubber grip, insulate the test solution from body heat. Widely Applicable It can be used to measure the salinity of seawater and provide accurate data on seawater concentration to marine life enthusiasts.