The magnetic attraction of a magnet to coated ferromagnetic material is a measure for the coating thickness. When lifting the LEPTO-Pen off the specimen, the built-in precision spring is elongated until the magnet snaps off the specimen. The elongation of the spring immediately before snap-off of the magnet corresponds to the attraction force and thus to the coating thickness.
The LEPTO-Pen is applicable for measurement in virtually every position (e.g. horizontally or vertically with magnet to the top - "overhead measuring"). With coating gauges, which operate according to the attraction principle, the working range of the spring is shifted slightly depending on its orientation due to the own weight of the magnet. The LEPTO-Pen compensates for this effect by means of the adjusting screw and a calibration mark on the scale (2).
All LEPTO-Pens come in a convenient plastics case with operating manual and individual acceptance report; the measuring range is from 10 Ám to 500 Ám or 20 Ám to 750 Ám.