Hygrometers are instruments for measuring the water content of the air in Percentage Relative Humidity (%RH). They can also be used to calculate the Dew Point when used with the relavent tables. We offer a selection of hygrometers including wet and dry bulb masons hygrometers, hair hygrometers and whirling hygrometers.

Whirling hygrometers, also known as sling psychrometers or aspirated hygrometers, employ the "wet" and "dry" bulb principle to determine %RH. They are designed to be rotated by hand to provide adequate and constant ventilation of the bulbs. The spirit thermometer tubes used in these hygrometers have a blue coloured LO-tox™ filling which has a similar accuracy and better legibility than the traditional mercury filling.


Whirling Hygrometer (Psychrometer) with Folding Handle

This traditional model has a folding handle and is available in its original design with mercury tubes or with the more environmentally friendly LO-tox™ blue spirit filled tubes Protection is provided by a canvas carry case. Size: 237mm x 143mm x 29mm Tube Filling Range Product No Mercury 0 + 50 °C only 13/644/2 LO-tox™ Spirit 0 + 50 °C only 13/744/2 For trade price & delivery: Please contact us for details. To buy this product now visit our retail webshop

Compact Whirling Hygrometer (Psychrometer)

This instrument uses shorter tubes and the design incorporates a "slide rule" type calculator to determine the %RH. The body of the instrument slides away into the handle providing complete protedtion when not in use. Size: 210mm x 36mm x 16mm Tube Filling Range Product No LO-tox™ Spirit -5 + 50 °C only 13/606/2 LO-tox™ Spirit 20 + 120 °F only 13/606/1 For trade price & delivery: Please contact us for details. To buy this product now visit our retail webshop

Masons Hygrometer

A wet and dry bulb hygrometer with a large water reservoir. Comes with wet and dry bulb tables. Range Product No °C only 13/222/2 For trade price & delivery: Please contact us for details. To buy this product now visit our retail webshop

Brass Dial Hygrometer / Thermometer

A traditional hair hygrometer design presented in a gold coloured dial case. Range Product No °C & °F 30/407/3 For trade price & delivery: Please contact us for details. To buy this product now visit our retail webshop

Other designs and specifications are available to special order. Most products can be branded and packed to your specifications. Minimum quantities apply. Tell us what you need using our product enquiry page.

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