GPO Tester for what purpose?
Does anyone know anything about the tester pictured? The label on the lid says "Tester RP1100 DGM RPW 1100/1B, the rotary switch is marked in mA/V, the meter is an unusually scaled 25-0-250 uA one. There are 2 push buttons on the side for zeroing and measuring, 2 input terminals and a compartment for a 1.5 volt battery underneath.
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