Whirling Hygrometer with Folding Handle.
This Whirling Hygrometer (also known as a sling psychrometer), uses a “wet” and a “dry” bulb thermometer to determine the relative humidity. The thermometers are mercury filled. The hygrometer has a handle allowing it to be rotated by hand to provide consistent ventilation of the bulbs.

Supplied complete in a protective canvas carry case with calculator chart and instructions to determine relative humidity.

Specifications:
Temperature Range: -5 to +50°C
Divisions: 0.5°C
Accuracy: +/-1°C

Dimensions:
Packaged: 235 x 136 x 30mm
Unpackaged: 230 x 130 x 23mm

Weight:
205g (including box, chart and bag)
Hygrometer: 138.5g

Last edited 23rd Nov 2021