Dual Function Moisture Meter Tests With Pins or Sensor Pad The AccuMASTER Duo Pro™ Pin and Pinless Moisture Meter is ideal for measuring moisture content in hardwood, lumber, firewood, drywall, plaster, brick and concrete before you begin work. With the AccuMASTER Duo Pro™ you'll always know you're selecting dry lumber when buying wood for building a project or selecting firewood for burning. You can also use the meter to help locate water leaks hidden behind ceilings, walls and under floors.