Omega Engineering Inc.s Litmustik® Pocket Testers with replaceable electrodes measure zero to 14 pH and 32 to 158F (0 to 70C) with 0.1 pH and one-degree accuracy. Features include a replaceable electrode design, a signal amplifier and temperature sensor. The device measures 6 H x 1.7 W x 0.9 D (152 x 43 x 23 mm) and sports a 0.5-inch (12.7 mm) high LCD. Three 1.55 V silver oxide batteries provide 200 hours of continuous use. Comes complete with batteries and operators manual.www.omega.cominfo@omega.com