HM Digital’s COM-80 is an economically priced water resistant, hand-held tester for both EC and TDS, featuring four built-in modes (?S, mS, ppm and ppt). Along with its modes, its pinpoint accuracy and digital calibration make the COM-80 HydroTester the most versatile and cost-effective meter in its class. It also includes onscreen diagnostic messaging and temperature in a large, four-digit LCD display. This unit was co-designed in the US and Korea and is backed by a one-year factory warranty. http://www.tdsmeter.com/products/com80.html, http://www.hmdigital.com, info@hmdigital.com