Features 1. SALINITY REFRACTOMETER: measure salt water or salinity of water,monitor and control the concentration of salt water and brine, ideal for aquariums and marine applications. 2. ATC FUNCTION: salty water refractometer with automatic temperature compensation, allow you obtain accurate readings easier and faster 3. AIRCRAFT ALUMIUM BODY MATERIAL: The aquarium refractometer is made of non-staining, non-corrosive and non-reactive metal and ABS which is lightweight to carry,anti-scratch and durable. 4. EASY TO USE: Only 2-3 drops of solution, can you read the result fast and accurately. Its 0-100% large scale range makes it be suitable in wider field. 5. WIDELY USED: Mainly used in food industry like pickling food, cooking food, fish processing products, seawater, brine, etc. Specification: Material: ABS, Metal Color: Black Size: 195mm in length Weight: 252g Package Included: 1 x Salinity Refractometer