The device is designed for measurements of moisture (%u) and water content (%w) of materials with flat surface and a thickness of at least 10mm. In addition, it is possible to find moist spots very quickly and comfortably by means of the âdetector modeâ, the display value here is relative [digit].The measurement takes place at an insulated measuring spot at the rear side of the device. The GMK 110 is particularly suited for moisture measurements in the following materials:WoodGRPThe GMK 110 is especially designed to meet the needs of moisture ratings of boats, camper vans and caravans. For use at construction site we recommend the GMK 100 (wood, floor screed and plaster characteristics, CM-humidity)