Review on Moisture Meter For Wood - Digital Dampness Sensor Detector For Wood, Firewood, Brick, Drywall, Paper, Floor, Plaster - Accurate Woodworking Moisture Gauge by Jay Williams

The gauge worked to test drywall for moisture in drywall under paint where there was evidence of a previous leak. Metal dowels can be driven into drywall, but be aware that the metal dowels will leave small holes that will need patching if you have to dive into the moisture test. I knew this was going to happen so it wasn't a problem for me.