Whirling Hygrometer,

Two thermometers engraved with les fronts mounted in case, Range -5 to +50 °Cx0.5 °C, supplied in carrying cover. The ventilated type of hygrometer gives greater accuracy for humidity determinations and is particularly useful for measuring local differences in humidity. There are two thermometers mounted in case, one having wick dipping into a water reservoir at the end of the frame. The thermometers are engraved with lens fronts for easy reading. Range - 5 to + 50 °C x 0.5 °C. Supplied in carrying cover.