This Extech 445715 Hygro-Thermometer with large digit display has a retractable probe with a 45.7 cm (18 inch) long cable. Humidity measurements from 10 to 99% rel. humidity, ± 4% rel. humidity and temperature measurements from -10 °C to +60 °C ± 1 °C (14 °F to 140 °F ± 1.8 °F). This meter also includes max, min and sleep functions and has a rear calibration adjustment pin with optional relative humidity calibration bottles. The scope of delivery includes a stand, a wall mounting bracket and a AAA battery.