The Fluke Calibration 1551A-12 Intrinsically Safe "Stik" Thermometer with Fixed RTD, -50 °C to 160 °C, 6.35mm x 305mm (1/4 in. x 12 in.) is a stainless-steel probe and digital readout, fixed together and calibrated as a single system. The accuracy specification is easy to understand, since it includes all uncertainty components, including drift, for up to one year. The large, backlit LCD display rotates 90°, making it easy to read from any angle. A user-configurable stability/trend indicator lets you know when your temperature is stable enough to record an accurate measurement. A user-settable auto-off function extends typical battery life to three hundred hours. A low-battery indicator and stop-measure function prevent erroneous measurements from being made due to low battery life. A simple, three-point calibration function allows you to easily and accurately calibrate the 1551A-12. Data logging to internal memory of up to 10,000 time-stamped measurements is optionally available.