'With the practical mini hygrothermometer, you can monitor the temperature and humidity through the clear display and ensure the optimal temperature and humidity for the instrument. The Hygro-ThermoMonitor can be free-standing, wall-mounted and has a handy magnet on the back. Advanced High-Precision Sensor: Equipped with a precise and sensitive sensor, it displays temperature and humidity. The LCD screen also displays DRY/OK/WET. When it is good, the humidity is between 45% -55%.'