I had to find a blockage behind a tile/cement board to install a rail in the shower stall. I've tried regular spike finders. It does not work. This unit did the job.
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π CAMWAY 6 Inch Digital Caliper with LCD Display, Electronic Vernier Caliper, 150mm Stainless Steel Feeler Gauge, Plastic Digital Caliper Set for Zero Setting Inside/Outside Diameter, Depth, and Step Measurement Tool
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