Determine the moisture content in wood, drywall, masonry, roofing, siding and other materials of construction using the Tramex MRH nondestructive digital moisture meter. An optional hygrometer mode (in conjunction with a relative humidity probe) measures relative humidity, temperature and dew point. The Tramex MRH features 4 scales for optimum sensitivity and selectable wood specific gravity adjustments from 0.30 to 0.80. The digital display reveals moisture in wood (3-40% scale) and a 0-100 relative scale for all other materials. Instrument also features a "Hold Reading" function and auto-correction for ambient temperature.