This Big Digit Hygro-Thermometer with extendable probe (18” cable) measures humidity from 10% to 99% RH and temperature from 14 to 140°F (-10 to 60°C). Accuracy of ±4%RH and ±1°C/1.8°F. This meter also includes maximum, minimum and rest functions and has a rear calibration adjustment post with optional RH calibration bottles. Comes complete with built-in stand, mounting bracket, sensor, and 1 AAA battery.