Eyourlife Salinity Refractomer Aquarium Optical Optics Refractometer With Auto Temperature Compensation ATC Digital Dual Scale Salinity Meter Hydrometer Specific Gravity For Saltwater Seawater Marine SALINITY REFRACTOMETER for measuring the salinity of salt water quickly and accurately, ideal for agriculture, industry and research application, such as Mariculture, Fish Culture, Aquarium, Marine Survey, Water Quality Monitoring, Salt Production, Manufacture of Normal Saline, Salinity Measurement in Food Processing etc. It can also be used for medical institutions and university research. DUAL SCALES: The Refractometer is a equipment to measure the liquidconcentration(the concentration of salt) by using the light, working basis on that the liquid with different concentrations have different light refractive index. The Measures on 2 scales: Specific Gravity (0.001, Range: 1.000 - 1.070, D 20/20,) and Parts Per Thousand (1, Range: 0-100). ATC FUNCTION: Automatic Temperature Compensation during 10-30, eliminating data errors caused by temperature changes and guaranteeing a consistent accurate result. WITH DURABLE STORAGE CASING: With a sturdy and light weighted case, it is very convenient to storage and carry. The body is made of stainless steel and is very durable, the eyepiece is in high quality for better viewing, adopting optical glass lens rather than plastic lens for accurate measurement. PACKAGING: 1 x Salinity Refractometer, 1 Pipette, 1 x Instruction manual, 1 x Mini screwdriver, with a durable storage case. 1 x Salinity Refractometer 1 x Pipette 1 x Instruction Manual 1 x Mini Screwdriver 1 x Storage Case with Inner Protective Tray