The Extech Big Digit Hygro-Thermometer displays both indoor and outdoor temperature and humidity. The device monitors humidity from 10% to 99% RH ± 5% RH and temperature from -10°C to 60°C ± 1°C (14°F to 140°F ± 1.8°F). A max/min with reset function saves and recalls high and low values for all four parameters. Comes with a built-in stand, wall mounting bracket, outside sensor with 89 cm (35 in) wire, and 1.5 V AAA battery.