Dew Point Calculator, 1,Provides Accurate Values of dew point and Relative Humidity 2,Easy to use and read 3,Portable Range: -10 to +50 degrees CelsiusAccuracy: ±1% with respect to standard tablesProvides accurate values of dew point and relative humidity (RH) from wet and dry bulbtemperatures measured by sling psychrometerEasy to use and read.