General Tools MH120 Masons Hygrometer

The General Tools and Instruments MH120 Masons Hygrometer measures relative humidity. Tool takes measurements of relative humidity by comparing wet and dry bulb thermometers. The instrument includes two red spirit thermometers. Comes in a sturdy white plastic case with a plastic reservoir bottle. The industrial tool has dual scale readings. Includes conversion chart for easy conversions and accurate measurements.

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