The HM100 Pin Moisture Meter, from E Instruments International (Langhorne, PA), is a portable unit for detecting the moisture levels of materials in a variety of different applications, including indoor air quality (IAQ), HVAC, building inspections, and more. According to the company, the HM100 is a highly sensitive instrument, and can measure moisture levels in many types of wood, concrete, plaster, and brick.
Check out www.e-inst.com to get more information.