Greisinger-GMI-15-Material-Moisture-Meter-Greisinger-GMI-15-P-The-Greisinger-GMI-15-is-a-Material-Moisture-Meter-for-high-speed-determination-of-moisture-in-buildings-contracting-work-etc-The-GMI-15-allows-detection-of-moisture-in-wood-down-to-a-depth-of-Approx.-3cm-&-in-concrete-or-wash-floor-down-to-a-depth-of-Approx.-4cm-The-meter-can-also-detect-moisture-behind-ceramic-tiles-&-or-various-wall-or-floor-coverings-P-P-To-check-moisture-simply-place-device-on-the-surfa