ALLOSUN Digital Thermo-Hygrometer with Humidity Alarm & Remote Probe/Humidity Monitor/Dew-Point Meter 1. Display the temperature, relative humidity and dew point. It can be operated easily and be ideal instruments for use in fields, laboratory, workshop, warehouse and home applications. 2. Humidity alarm feature can be turned on or off. The humidity alarm limits can be set according to your reality needs. LED Alarm. 3. Temperature-Humidity Sensor can be mounted on the left side of the meter or extended for measurements in other locations. The meter can be mounted on wall or placed on a flat surface. Sensor probe is about 1.64 feet (50cm). 4. Data memory of max/min temperature and humidity values are available. Fahrenheit/Celsius can be exchanged according to your application preference. 5. Large LCD display. Power supplied by 2 x 1.5V AAA battery (Not provided by seller).