Milwaukee MA887 Digital Salinity Refractometer Thousands of saltwater aquarium enthusiasts have dialed in their analysis using Milwaukee's salinity refractometer. The MA887 generates a digital readout within seconds. It is accurate to ±2 ppt with automatic temperature compensation (ATC). Features: Fast, accurate results with digital dual level LCD readout Easy measurement with just 2-3 drops of sample and results in less than 2 seconds Automatically temperature compensated Simple one-point calibration using distilled or deionized water Easy-to-clean stainless steel sample well, unit rated to IP65 as "dust tight", and protection against water jets Battery percent level indicator with automatic shut-off (batteries included) Specifications: Range: 0 to 50 PSU: 0 to 150 ppt | 1.000 to 1.114 S.G. (20/20) | 0 to 80°C / 32 to 175°F Resolution: 1 PSU | 1 ppt | 0.001 S.G. (20/20) | 0.1°C / 0.1°F Accuracy: ±2 PSU | ±2 ppt | ±0.002 S.G. (20/20) | ±0.3°C / ±0.5°F Light Source: Yellow LED Measurements Time: Approximately 1.5 seconds Minimum Sample Volume 100 µL (cover prism totally) Sample Cell Stainless steel ring and flint glass prism Temperature Compensation: Automatic between 10 and 40°C / 50 to 104°F Case Material: ABS Battery: Type 1 x 9V AA (included) Battery Life: 5000 readings Auto-shut off: After 3 minutes of non-use Enclosure Rating: IP65 Dimensions Meter: 7.6 x 4 x 2.64 inches (192 x 102 x 67 mm) Weight Meter: .93 lbs. (0.42 kg) Dimensions Package: 11 x 6.8 x 4.6 inches (268 x 172 x 118 mm) Weight Packaged: 1.46 lbs. (0.66 kg) Milwaukee MA887 Manual