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VIVOSUN Thermometer & Hygrometer gauge is the optimal solution to keep your indoor environment at a comfortable level. It has an ultra-accurate temperature reader (±0.1℉ or ±0.1℃) and a wide temperature range, from 14℉ to 122℉ (-10℃~50℃); a humidity range from 10% to 99% RH. The VIVOSUN Thermometer & Hygrometer guage not only provides reliable readings but also give you daily updates on the record humidity/temperature highs and lows of all time, allowing you to compare the current readings to those of the past. This gauge makes it easy to adjust the temperature & humidity levels to comfotable levels, creating healthier environments and maintain plant health. Humidity level Indicator: DRY: less than 30% OK (COMFORT): 30%~60% WET: higher than 60%