Features: For measuring seawater (Marine aquariums) or solution with very low salt concentrations. Automatic temperature compensation (ATC) for immediate and accurate calibration reading. High precision prism with clearly measurement level. Adjustable manual focus for easily focus and calibrate. Lightweight and portable, the salinometer is simple designed and easy to operate. Comes with a storage pouch and a soft dropper. Widely use in the industrial areas, agricultural production and marine aquaculture industry like food and beverage, salted preserved vegetable, salt manufacturing, aquarium, and preparation of normal saline, etc.