The ULTRASON wall thickness gauge can be used to measure the thickness of a workpiece when conventional means such as calipers or micrometers cannot be used. The coating thickness gauge measures the coating layer applied to a ferrous or non-ferrous substrate. The recording thermo-hygrometer controls a room, such as a laboratory or quality department, by recording temperature and humidity. Values are recorded and can be exported to a PC with the software. The tachometer measures the rotational speed with or without contact.