2 Vintage Gauges / Meters? - They say Grid on them

Description

UNTESTED. FOR PARTS OR NOT WORKING. I've never used them or tested them. I'm selling them as untested and to be on the safe side for parts or not working. They have scratches, blemishes, flaws, imperfections, etc. They're dirty and could use some cleaning.
I don't know what they are or what they do. They say Grid on them. I don't think this is the brand name but may have something to do with their function. I'm not an expert on them so take a look to see what you think.