The Extech VT30 is a voltage, continuity, and phase tester that includes a built-in flashlight and a backlit digital display with bar graph. This tough tester features a double-molded IP64 housing, polarity detection with LEDs for positive and negative DC, and a CAT III 600 Volt / CATIV 600 Volt safety rating. The VT30 has a one-year warranty, two AAA batteries, a protective cap, and a bag case.