Measuring depth:Non-destructive moisture meter has a measurement depth of 5-40 mm and can identify potential moisture problems up to 40 mm below the surface. In addition, the current reading can be recorded via hold function. Large Display:The wall damp meter has dual displays, including a large LCD and a three-color LED bar chart and alarm tone, easy to read. Customization Parameters:The machine comes with a adjustable of the humidity alarm value according to the your needs, After all you knows the real working environment the most. Hold Function:Damp tester has a hold function that "freezes" the current value, If the display is not recognized, this is not a problem. For this purpose, it offers maximum and minimum moisture values.The built-in flashlight allows you to quickly and easily check surface moisture in dark workplaces. The moisture tester gives relative reference values (not lab-grade precision), quickly showing overall wetness or dryness trends for fast decisions. Its unique spherical probe improves contact for easy measurements in tight, curved, and hard-to-reach spots., Weight: 0.3637627323 pounds, Manufacturer: SHENZHEN REDDRAGON INSTRUMENTS CO.,LTD