This is a dual function moisture meter that can test with either pins or a sensor pad. The meter has a sensor pad on the back that is perfect for testing hard surfaces and other materials without damage. It can conduct tests quickly down to a depth of in. By pushing a button you can switch testing with pinpoint accuracy using the pin mode. The pins are sharp stainless steel probes that are 3/8 in. L. You can push them in at various depths to test wood and other building materials to verify its moisture content. It is ideal for measuring moisture content in hardwood, lumber, firewood, drywall, plaster, brick and concrete. With the AccuMASTER Duo Pro you’ll always know you’re selecting dry lumber for a project or getting seasoned firewood for burning. You can also use the meter to help locate water leaks hidden behind ceilings, walls and under floors.