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Albion Engineering 875-1 Delamination Detection Tool (DDT)
Non-destructive rotary percussion testing tool Quickly detect invisible delamination, voids, and hollows beneath concrete, tile and natural stones More efficient than chain drag Threaded to accept a standard painter's extension pole or broom handle...
https://www.bizrate.co.uk/homehardware/albion-engineering-875-1-delamination-detection-oid32332693224.html