The Triplett MS300 measures relative moisture content in wood (0.1 to 99.9%) and other building materials (0.1 to 99.9%). It utilizes a spherical sensor for non-invasive pinless testing. Low, Medium and High icons indicate moisture level and an audible indicator increases as the moisture level gets higher for quickly scanning large areas. Data Hold freezes measurement on screen for hard to see areas. Self-calibration on power up. Low battery inicator and auto power off after 20 seconds. For home inspection, water damage restoration, lumber yards, painting, paper mills, textile, clothing manufacturing, and other industries. Includes 9V battery. 1 -year warranty.