The ArmItThings MaxTemp Temperature Sensor* can monitor any temperature range from -40C to 100C or -40F to 212F. You receive alerts when the temperature is above range, below range and we let you know when its back to normal. With the 'Network Inside' and battery power you can use it virtually anywhere. The MaxTemp has an internal sensor and external Waterproof Digital Temperature Sensor. You can set a specific range for both sensors.