RH200W is Extech’s Hygro-Thermometer base station, with easy-to-read 1.3" (33mm) big digits, displays indoor Temperature and Humidity levels. It can be connected wirelessly up to eight transmitters to read outdoor Temperature/Humidity levels or any remote locations up to 98ft (30m) away. The large LCD is designed with a convenient night light. It also shows special icons that indicate indoor comfort levels, favorable snow conditions, trending arrows for increase, steady, or decrease of the readings, and it also displays the Min/ Max levels recorded during the measurement duration.