Dämpfungszeiger (Attenuation Meter)
Built in 1942 by Siemens & Halske, this device was used for to test attenuation on telephone lines. Attenuation is signal loss due to the resistance factor of the transmission cable, and is measured in a unit called the Neper.



The meter is contained in this very nice wooden box with a lock and the key was attached to the cary handle with a piece of wire.



Here is the opened case showing the telephone connectors and the large Neper meter. The schematic is on the underside of the lid.



This is the original manual which came with this device. It is dated April, 1942.



This stamp on the manual indicates ownership by Berlin HQ of the SS.



The manufacturer's data