Digital Refractometer for Salinity The DRS series are developed for measuring the concentration of ketchup, mayonnaise, pickle juice, salt water and brine. The DRS series proves themselves invaluable for agriculture, food processing and wildlife management. This instrument is equipped with an Automatic Temperature Compensation System making it ideal for field use. Product Specification Model Scale Range Div. Accur. DRS0-28 Salinity 0-28% 0.1% ?.2% DRS0-28nD Salinity Refractive Index 0-28% 1.3330-1.3900 0.1% 0.0001 ?.2% ?.0003 DRBS-300 Brix Salinity Refractive Index 0-35% 0-28% 1.3330-1.3900 0.1% 0.1% 0.0001 ?.2% ?.2% ?.0003 Temperature Measurement Range:0'C-40'C(32-104'F) Precision of Measurement temperature:?'C(2'F) Measurement temperature Resolution:0.1'C Operation Temperature:0-35'C(32-90'F) Storage temperature:0-50'C (32-122'F) Dimension :185?9?5mm Weight:230g Power Supply:1battery(9v) Operating Time:More than 2000 times per battery Automatic Temperature Compensation Automatic Shut Off Conversion between Centigrade and Fahrenheit Degree Alarm of Low Voltage