Legend has it, some of the Fisher children left Fisher to start Metrotech. If you know otherwise, please provide additional info in the comments, and we will spout the truth! Metrotech still manufactures a variety of high end voltmeters and the like today.
I think the model pictured is a 220A. I’ve seen various 220s with red, orange, and black coils. This monster had a headphone jack and a meter straight out of a cold war era nuclear submarine.