Amprobe TH-2A Humidity Temperature Meter measures humidity and temperature in the range from -20°C to +60°C (-4°F to +140°F) with a resolution of 0.1% RH, 0.1°C, and 0.1°F. It calculates dew point and wet-bulb temperatures. The device stores maximum and minimum values and elapsed time, which can be displayed in different formats (min:sec or day:hour). The auto power-off function can be set to different time frames (1 minute to 59 minutes or disabled). The device is powered by a single 9V battery.