Vintage WILD HEERBRUGG Electronics mA MEL 13 Tester Steam Punk

Description

Here we have a Testing electronic instrument by WILD HEERBRUGG Made in Switzerland TYP. MEL-13 # 45787 prom. V 110~250 VA 40 Hz 50-60 with Honeywell model MMIT mA gauge made in the USA. Leather handle all knobs work nicely. Powers up. I don’t know what it is used for could use some help there. But rare I can’t find another.
Thanks for looking in JPs Treasure Chest !