The Extech Big Digit Hygro-Thermometer has an extensible probe and a 45.7 cm (18 in) cord. The device monitors humidity from 10% to 99% RH ± 4% RH and temperature from -10°C to 60°C ± 1°C (14°F to 140°F ± 1.8°F). This meter also has maximum/minimum and rest functions, as well as a rear calibration adjustment post for optional RH calibration bottles. Comes with a built-in stand, mounting bracket, sensor, and one AAA battery.