The Fluke 51 II single input digital thermometer delivers fast response with laboratory accuracy (0.05% + 0.3°C). You can use the 51 II to measure contact temperature on motors, insulation, breakers, pipes, corroded connections, liquids, and wires with industrial standard J, K, T, or E-type thermocouple temperature sensors. The user friendly-front panel and large, backlit display make it easy to view results. And the sleep mode feature preserves battery life to give you a typical thousand hours of operation. Other useful features: Easy-to-access battery door that allows replacing the battery without breaking the calibration seal; Comes with splash- and dust-resistant case protected by an impact-absorbing holster and a three-year warranty; Powered by three, standard AA batteries -30-; Includes an electronic offset function that compensates for thermocouple errors to maximize overall accuracy; Handles temperatures up to 900°C (1600°F); Provides a user-friendly front panel that is easy to set up and operate; Offers sleep mode to increase battery life; 1000-hour battery life