The Model WPH1 waterproof, pocket-sized pH tester offers ±0.2-pH accuracy, yet weighs less than a bar of soap, the manufacturer says. Buoyant as well as waterproof, the Valox®-housed, IP67-rated instrument features one-button calibration to meet buffer standards of pH 4, 7, or 10; a hold function to freeze a reading until logged; and a 21¼2-digit LCD display, which shows error messages for low battery, over range, or incorrect calibration. Range is -1 to 15 pH with a resolution of 0.1 pH.

Dwyer Instruments, Inc., P.O. Box 373, Michigan City, IN 46361; 219-879-8000; 219-872-9057 (fax); (e-mail); (Web site).