Air Thermometer and Hygrometer Our air thermometer and hygrometer feature a Swiss-made high-precision sensirion sensor, ensuring exceptional accuracy. The indoor temperature range is +14.2 F to +122 F, while the outdoor temperature range is -58 F to +158 F, and indoor/outdoor humidity range from 1% to 99%. Temperature accuracy is +/-0.5 F, and humidity accuracy is +/-2% Patented Technology U UNNI has advanced patented wireless technology that allows for more powerful and consistent data transmission. The personal wireless temperature humidity monitor updates and transmits data within a 330 ft radius every 30 seconds, enabling you to monitor all your essential locations with confidence Features Say goodbye to climate concerns! Our wireless hygrometer thermometer gauge provides real-time weather forecasts, indoor and outdoor temperature and humidity readings. The display includes heat index, dew point index, and mold index for all sensor locations. Large Clear Display The compact display is easy to read with bold, black information.