Introduce：1. Specification: Soil Temperature Range: -20℃～+70℃ (-4℉ ～ +158℉) Air Temperature Range:-10℃～+50℃ (+14℉ ～ +122℉) Air Humidity Range: 20% ~ 99% RH Power-supply: 9V battery 2. Functions: * Air temperature & Soil temperature display * Air humidity display *Sunlight intensity display * Temperature unit ℃/℉ changeable *Data-hold function * Display of comfort degree ①smile face appears @ air & soil temperature: 15℃ ～30℃ sad face appears @ other temperature ②smile face appears @ humidity: 60% ～80% sad face appears @ other humidity