The Whirling Hygrometer, (or Sling Pyscrometer), is an established and well-known method for determining the relative humidity and if there is any moisture on steel prior to painting.
The Whirling Hygrometer is one of the most economic methods of monitoring relative humidity and dew point utilising wet and dry bulb thermometers.
Temperature range of -5°C to 50°C.
Offers maximum level of accuracy
Measuring chart supplied
Complies with International Standards: BS 2842 and ASTM E 337-B
Dimensions: 22x 4.5x 1.1 cm (8.8 x1.8x 0.4 in)