Shinwa Sokutei Underground Sensor Electric Wire Detection 79152 Home+

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It detects metal, wood, or plastic behind the wall and alerts you with a light and an electronic sound. Detection depth: Approx. 19mm Power supply: 1 x 9V alkaline battery (The battery included is for monitoring purposes and may have a short lifespan.) Usable wall materials: plywood, gypsum board, reinforced gypsum board (some types are not allowed) Detectable materials: Wood and metal (can no longer distinguish between wood and metal)