Hanna Instruments HI 98311 Waterproof (Low Range) EC/TDS/Temperature Tester
The Hanna Instruments HI98311conductivty, TDS and temperature tester is a simple , affordable pocket tester for conductivty and TDS detemination.  The tester comes with a replacable electrode, automatic calibration and temperature compensation and an automatic shut-off for battery preservation. The COnductivity range is 0 - 3999 uS/CM. TDS is 0 - 2000 PPM.