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Wiktionary
cover meter

alt. An instrument for locating rebars and measuring the depth of concrete that covers them. n. An instrument for locating rebars and measuring the depth of concrete that covers them.

Wikipedia
Cover meter

A cover meter is an instrument to locate rebars and measure the exact concrete cover. Rebar detectors are less sophisticated devices that can only locate metallic objects below the surface. Due to the cost-effective design, the pulse-induction method is one of the most commonly used solutions.