S.A.E. - Working tool Industrial design - Electrical potentiometer

The device shown is a potentiometer, an electrical measurement instrument produced by the historic Italian company S.A.E. - Società Applicazioni Elettrotecniche of Milan. The company, founded by Siliprandi F.lli Chiesa & C. S.r.l., specialized in manufacturing scientific and technological instruments such as pyrometers and recording thermometers, and was active at least until the mid-20th century.
These types of portable toolbox instruments, such as the Wheatstone bridge or potentiometers, were common before the advent of digital testers and were used to measure electrical resistance or other quantities, often as precision tools for fault diagnosis.
The photos are an integral part of the description. Not tested.
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