MAR TESTER
According to Oesterle Model 435

Scars on surfaces are unsightly, especially on smooth, glossy surfaces. Surfaces can be ruined so
easily - for example marks on the matt polished surface of a table, by a fingernail, or on the shiny
bodywork of a Cadillac, by a twig. Great annoyance can result from such small causes. The traditional test for the resistance of surfaces to such damage was to try to mark the surface with a
fingernail. With the Mar Tester, Model 435, the quality of the surface can be measured accurately.

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