Salinity Meter (Optical Refractometer)

Salinity Meter (Optical Refractometer),hand held,calibrated for salinity,(range 0-100 PPt x 1PPT) accuracy 1PPT and RI (1.000 to 1.070 x 0.0001) automatic temperature compensation, zero calibration,metal tube construction, 200mm long x 30mm dia,suits marine,,environmental and food studies,  in plastic case