If the high precision of electronic coating thickness gauges is not required, there is a simple and inexpensive alternative. For these applications the coating thickness gauge LEPTO-Pen is the right choice. The LEPTO-Pen works on commercially available unhardened steel according to the well-known adhesive force principle (EN ISO 2178). It consists of a precision magnet and a mechanical spring balance whose scale is calibrated and labeled in µm coating thickness.