Klein Tools ET140 Moisture Meter is designed to non-invasively detect hidden moisture content up to 3/4-Inch (19 mm) depth. Easily select between materials with mode button to test surface of drywall, masonry, hardwood, and softwood. The ET140 has easy viewing with bright, reverse-contrast display and LED bar graph. For more than 160 years, Klein Tools has manufactured premium-quality, professional-grade hand tools that deliver the performance, durability and precision needed to get the job done right. Our family of engineers, workers and craftsman continue to put six generations of expertise into every tool we create by using only the highest quality materials, superior workmanship, and keeping manufacturing as close to home as we can. Klein isn't just the name of our company, it's also our family name. And since we're an American company that's family-owned and family-run, you know you can count on us to be here tomorrow. Klein Tools doesn't just make great products, we make great products that stand up to the demands of the professionals who use them every day ... Since 1857. WATER LEAK DETECTOR detects relative moisture content from leaks and flooding PINLESS MOISTURE METER measures relative moisture content in building materials NONDESRUCTIVE DETECTION up to 3/4-Inch deep using Electromagnetic field (EMF) technology USE ON DRYWALL, MASONRY, HARDWOOD, AND SOFTWOOD; calibrated for these materials only REVERSE-CONTRAST DISPLAY for easy viewing of reading and nine LED bars to indicate moisture range FULL FEATURE TOOL includes hold, low battery, and auto-power off functions COMPLETE MOISTURE METER KIT includes meter with 2m drop protection, 9V battery, and instruction manual