General Tools tester is a device designed for detecting leaks and measuring moisture levels. It works with various surfaces and materials, including construction mixes, drywall, and wood. Special probes — metal pins — are used to measure moisture with maximum accuracy. Information is displayed on a bright, LED-backlit screen, convenient for working in low-light conditions. It also has both visual and audible indicator systems. The compact scanner fits comfortably in hand, and a protective cap is included to prevent damage to the probes. It operates on a 9V battery.