General Tools MH120 Masons Hygrometer, a dew point wet bulb thermometer, measures relative humidity by comparing the wet and dry bulb thermometers. General Tools MH120 Masons Hygrometer also features Dual scale readings. Formerly Mannix Instrument.
Proposition 65 Warning for California Residents: This product can expose you to chemicals including Benzene, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to Related Items
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