This 3-Piece Klein Tools GFCI Outlet Tester, Non-Contact Voltage Tester Pen, and Pinless Moisture Meter tool set is perfect for home inspections. Receptacle Tester (Cat. No. RT210) is designed to detect the most common wiring problems in standard and GFCI receptacles. Non-Contact Voltage Tester Pen (Cat. No. NCVT1P) detects standard voltage in cables, cords, circuit breakers, lighting fixtures, switches, outlets and wires. Moisture Meter (Cat. No. ET140) is designed to non-invasively detect hidden moisture content up to 3/4-Inch (1.9 cm) depth.