Hobein Aquarium Salinity Refractometer for Brackish/Marine/Reef Tank Testing, Dual Scale Automatic Temperature Compensation 0-100ppt and 1.000-1.070 Specific Gravity with ATC - Product Features
DUAL SCALE: Measuring Ranges: 0-100 ppt of Salinity and 1.000 to 1.070 Specific Gravity (0-10%)the reading resolution is 0.1 %. Salinity Accuracy: +/-0.1%