The Hanna Instruments HI99151 is a rugged, waterproof, and portable pH/temperature meter designed specifically for the brewing industry. The HI99151 uses the FC214D, a titanium bodied, gel filled pH electrode that features high temperature glass and an extendable cloth junction. The HI99151 measures pH from -2.00 to 16.00 pH and temperature from -5.0 to 105.0 ºC (23.0 to 221.0 ºF). Automatic calibration is done at one or two points and all readings are automatically compensated for temperature variations. Indicators for stability, battery percentage, and calibration instructions are viewed on the primary display. The HI99151 uses three 1.5V AAA batteries for an exceptional battery life of 1200 hours of continuous use.