The on-board temperature humidity Honeywell® sensor is rated for -40°C to 85°C or -40°F to 185°F making it a viable product for most applications. This WiFi Temperature Humidity Sensor for MQTT was developed to work with any MQTT Broker. Your recently viewed items and featured recommendations, Select the department you want to search in. -40°F to 140°F. The Temperature and Humidity Sensor can be paired with a variety of compatible indoor digital weather stations (sold separately) to view current conditions at-a-glance, or it can be used with the AcuRite Access (sold separately), allowing you to monitor your sensor information from anywhere in the world using your smartphone, computer or tablet. This interchangeable module has miniaturized electronics and does not require recalibration. $0.96 + $3.32 shipping . Temp Stick WiFi Remote Temperature & Humidity Sensor. The external-probe air temperature and humidity sensor uses air flow to measure temperature and humidity levels. Have one to sell? As one of the world’s most popular IoT protocols, MQTT is an essential, easy to use tool for viewing data from a wireless sensor device. X. 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