Testo 608-H2 [0560 6082] alarm ThermoHygrometer, is an accurate humidity/dew point/temperature measuring instrument for the continuous measurment of of a given area over an extended period of time. With a large display it is easy to read, even at a distance and the suspension and stand fixtures allow for flexible placement on walls and tables. In addition The 608 H2 ThermoHygrometer has LED alarm function for accurate signals in the case of humidity and temperature limit violations. It displays min/max readings and comes with a 9V block battery and with the stable long-term sensor is can give accurate measurements for years.