Salinity Refractometer, Aquarium & Seawater - Dual Scale (1.0 to 1.070 S.g.) Presented by Magnum Media Measures on 2 scales, Specific Gravity 1.000-1.070 (D 20/20) and 0-100 parts per thousand () Measure salt water or salinity of water, ideal for aquariums and marine monitoring Features Automatic Temperature Compensation (ATC) from 10-30'C/50-86'F Comes with Hard Case, Plastic Transfer Pipette, Screwdriver and Wiping Cloth 3 Year Manufacturer warranty through Magnum Media