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A traditional Wet and Dry Bulb Mason s hygrometer. Comprising Moulded plastic wall mounted case- two thermometers mounted on a silk screened scale - plastic reservoir and cotton wicks. Supplied with wet and dry bulb tables for determining humidity levels. All parts are replaceable and available as spares Red spirit non toxic °C/°F This is a quality item produced by Zeal England who have been trading since 1888. Please note that to calculate relative humidity it is necessary to consult the supplied hygromatic tables, if you requre a simple instant readout of humidity please consider our digital version, part number: ZEAL PH1000.
