Measures Humidity, Temperature and Calculates Dew Frost Point Sword probe for equilibrium relative humidity & temperature Application range 0â€Â¦100 %rh -10â€Â¦60 C Battery charge monitor (low battery indicator) Hold function, Auto power off Integrated, hinged aluminum sword probe 9 V battery Adjusted at 23°C and 35,80%rh Large, clear display parameters Accuracy :±1.5