Milwaukee MA887 Digital Seawater Refractometer – PSU, ppt & Specific Gravity with ATC

The Milwaukee MA887 Digital Seawater Refractometer is a portable precision instrument designed for fast and accurate measurement of the salinity of natural seawater, artificial seawater, ocean water and brackish water. Unlike traditional optical refractometers that require users to visually interpret a scale, the MA887 digitally measures refractive index and temperature and converts the result into one of three commonly used salinity scales: PSU (Practical Salinity Units), ppt (parts per thousand) or Specific Gravity S.G. (20/20). Results are displayed in approximately 1.5 seconds. The instrument features Automatic Temperature Compensation (ATC), simple one-point calibration using distilled or deionized water, an easy-to-clean stainless-steel sample well and flint-glass prism. Only a small sample volume of approximately 100 µL is required for measurement. Key Features Digital seawater/salinity measurement Measures in PSU, ppt and Specific Gravity (S.G. 20/20) Automatic Temperature Compensation (ATC) Large dual-level LCD displaying measurement and temperature Measurement completed in approximately 1.5 seconds Requires only about 100 µL of sample Simple calibration using distilled or deionized water Stainless-steel sample well Flint-glass optical prism Yellow LED light source IP65 enclosure protection Battery-powered for portable field or laboratory use Low-battery indication Automatic shut-off after approximately 3 minutes of inactivity ABS housing for durability. Technical Specifications Specification Details Brand Milwaukee Instruments Model MA887 Product Type Digital Seawater / Salinity Refractometer PSU Range 0–50 PSU Salinity Range 0–150 ppt Specific Gravity Range 1.000–1.114 S.G. (20/20) Temperature Range 0–80°C / 32–176°F PSU Resolution 1 PSU ppt Resolution 1 ppt S.G. Resolution 0.001 Temperature Resolution 0.1°C / 0.1°F PSU Accuracy ±2 PSU ppt Accuracy ±2 ppt S.G. Accuracy ±0.002 Temperature Accuracy ±0.3°C / ±0.5°F Light Source Yellow LED Measurement Time Approx. 1.5 seconds Minimum Sample Volume 100 µL Sample Cell Stainless-steel ring with flint-glass prism Temperature Compensation Automatic Protection Rating IP65 Housing ABS Battery 1 × 9 V battery Battery Life Approx. 5,000 readings Auto-Off After 3 minutes Dimensions 192 × 102 × 67 mm Weight Approx. 420 g