HM Digital announces that the TDS-3, the standard for inexpensive hand-held TDS meters, has been upgraded. It features a rugged housing and useful case, hold button, large screen and long-lasting batteries, a wide of 0-9990 ppm and exceptional accuracy. The meter now includes a built-in digital thermometer and improved automatic temperature compensation (ATC). The additional features are made available at no extra cost and the TDS-3 is backed by a three-year warranty.www.hmdigital.cominfo@hmdigital.com