Hi /his/,
Found this in our storage from when my grandfather died and I'm not sure of the story of this item(when it's from, what it might've been used for) grandfather was a Swiss tank gunner who went AWOL to Canada near the end of WWII if that helps. Anyone know what it is? Will follow up with another pic
Any info will be appreciated
It's a frequency meter from the U.S. Army's signal corps.
What's it do?
It will give what is the frequency of a input signal between 125 to 20 000 kylocycle.
Could be use to adjust frequency of radio and such.
t. avionic technician