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This non-contact voltage detector tester pen is manufactured with a buzz & flash alarm as a voltage warning alert. It is ideal for use in dark environments & will distinguish between live & neutral. It has a single multi-use switch: press once for on, press again for light, then press and hold for off. It requires 2 x AAA 1.5V batteries (supplied). Detection Range: 90~1000V AC CAT III. CE Approved Product SKU ST-HD-MT105 x 1