Digital Refractometer with built in LED light source.
Displays three different measurement units: Salinity in parts per thousand, Specific Gravity, and Practical Salinity Units (PSU).
Temperature is also displayed. Includes ATC Automatic Temperature Compensation.
9V Battery Operated with Auto Turn Off.
Ranges include 0-150 ppt, 1.000 to 1.114 SG, and 0-50 PSU.
Temp from 32 - 176 degrees.