Klein Tools, Electrical Test Kit with Multimeter, Non-Contact Volt Tester, Outlet Tester. The MM300 multimeter measures AC/DC voltage, DC current and resistance and has a safety rating of CAT III 600V, Class 2, Double insulation. The NCVT-1 has a bright green LED to indicate the tester is working. It changes to red and warning tones sound when voltage is detected. NCVT-1 has a digitally-controlled ON/OFF power button and auto power-off feature to conserve and extend battery life.