Abstract: An instrument for measurement of thickness of a non-magnetic layer on a magnetic or magnetizeable substrate including a permanent magnet having a test pole which is resting against the non-magnetic layer and an opposite pole, a comparison body arranged at a distance from the opposite pole, a mechanism for adjusting the spacing of the comparison body from the opposite pole until the magnetic fields between the comparison body and the opposite pole and between the substrate and the test plate are equal and a device for displaying such spacing. In this manner, the gap between the comparison body and the opposite pole of the magnet becomes the same as the spacing between the test pole and the substrate which is the thickness of the non-magnetic layer. Different embodiments are presented. In three of the embodiments, when the magnetic fields become equal at both poles of the magnet, the magnet moves away from the non-magnetic substrate.

Abstract: A housing forms a chamber having a bottom wall, and a discharge tube communicates with the chamber in the region of the bottom wall, being upwardly inclined exteriorly of the housing and having a free end insertable into a dispensing opening of a container. A dispensing tube extends from the interior of the chamber through the bottom wall to the exterior of the housing, and an arrangement is provided for dispensing via the dispensing tube metered quantities of liquid which enter the chamber from the container through the discharge tube.