REED Instruments R6001 Thermo-Hygrometer, -4 to 140&deg;F (-20 to 60&deg;C), 0-100% RH Temp./Humidity Range: -4 to 140F(-20 to 60C) / 0 to 100% RH Dual LCD readout displays temperature and relative humidity Data hold, Min/Max and Relative functions Low battery indicator and auto shut-off Includes battery