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Our newest Megatester has a Cree Q3 LED, making this tester super-bright. Giving off 350 Lumens of light and having an extended lifespan. Use Megatester to trace wires, find bad grounds and test unenergized circuits that are 3Volt to 220Volt AC/DC. Megatester is UL Listed and is made to the highest quality standards, we back this up with an unconditional lifetime guarantee, and comes with a how to test guide which demonstrates how to safely and easily find and repair electrical problems at home, work, on tools, cars, boats and airplanes.