The tool smart digital moisture meter is your first step in preventing dangerous growths in your home. Water and moisture build-up in a home can lead to hazardous and unsafe living conditions. By checking suspicious water stains around the house, you can determine whether the area is wet or has long since dried. Using the free tool smart app, readings can be tracked over time and placed onto pictures for quick and easy reference points. Details: easily determine the moisture content of wood and other building. Materials: conveniently use your phone as a second screen for easier visibility and to simplify two-person jobs; quickly save your readings to the tool smart app on your phone and organize your findings by project for easy reporting. Help prevent dangerous growth by detecting leaks early. Check water-damaged areas to see if moisture is still present; overall measurement range of 5 to 50% for wood and 1.5 to 33% for building materials specifications. Measurement range: 5 to 50% for wood; 1.5 to 33% for building materials. Measuring accuracy: ±2%; test pin length: 9mm (0.35 in.); operating temperature: -4 degrees to 140 degrees (-20 degrees to 60 degrees) @ <85%rh; current consumption: <50mA; auto power-off trigger: 3 minutes of inactivity; dimensions: 7.01 x 2.76 x 1.65 in.(178 x 70 x 42mm); weight (without battery): 4.1 oz. (115G) ; power source: "9V" battery (included) includes; "9V" battery; extra set of test pins.