Ht-2 Features: Simultaneously displays temperature, humidity and time with digital lcd. Displays dry, moist or comfort according to different temperature and humidity. Length of the probe is up to 3 meters that can fit for most environments. Displays time with alarm function. Can efficiently protect the sensor from sun and rain so as to reduce the measuring error and, it can also reduce the influence from directly contacting with frozen foods when the equipment is used in a refrigerator. Can be placed on the table, nailed on the wall or fixed on iron plate with powerful magnetic Iron. Technical parameters: Indoor temperature : -30~+50 Outdoor temperature: -50~+70 Humidity measuring range: 20%rh~99%rh Accuracy: temperature: 0.1; humidity:1% Power supply: one 7# alkaline battery (1.5v) when voltage is low, it will show low bat.