Innovating Safety & Productivity for the Corrosion Control Industry

Dewpoint Calculator

The Dewpoint & RH% Slide Calculator is a simple and easy to use slide rule which allows the dew point temperature and relative humidity to be determined from the wet and dry bulb readings of the Whirling Hygrometer.

The determination of dew point is essential to ensure that moisture or condensation does not form on work prior to painting.


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Easy to use, for the dew point, slide the known wet bulb temperature under the depression (i.e. the dry bulb minus the wet bulb) and read the dew point under the arrow at zero. For the relative humidity, slide the dry bulb reading over the known dew point and read the relative humidity against the arrow.

Supplied in a Protective Pouch.

Scales used are traceable to the UK Meteorological Office.

Product Code Description Price
Dewpoint Calculator POA