This is called a Schmidt hammer or rebound hammer and is used to test the hardness of concrete. : r/specializedtools
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Rebound Hammer Test | Schmidt Hammer Testing on Concrete
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![Operation of the rebound hammer as schematic [12]. | Download Scientific Diagram](https://www.researchgate.net/publication/318750890/figure/fig1/AS:521089371435008@1501248795613/Operation-of-the-rebound-hammer-as-schematic-12.png "Operation of the rebound hammer as schematic [12]. | Download Scientific Diagram")