The Extech RH200W is a wireless multi-channel hygrometer/thermometer and displays indoor temperature and humidity. Up to eight wireless transmitters can be connected to measure temperature and humidity at distances of up to 30 m (98 ft). The LCD display shows icons indicating the indoor comfort level and trend arrows indicating increase, decrease or constant values. It also records the minimum and maximum values for the duration of each measurement session. Ideal for multi-room environmental monitoring for restaurants, production facilities, offices, houses and apartments, greenhouses and storage/archive buildings.