That does bring back some really old (1968) memories..
Radio Shack made a look-a-like meter. I was a Tech and my buddy was a General class.
He needed a glass surface to grind down a 40 meter crystal. He used the meter face!
The glass turned so white with micro-scratches, you couldn't see the readout with wetting it.
He would spit on the glass when he needed to check a voltage! LOL!
I offered him $5 for the meter. He just gave it to me, free..
I sprayed the glass with clear krylon (antenna spray) and it was readable!
I used that meter for about 20 years before selling it for a new TRS digital..
My Ham gear isn't used much these days. I'm avoiding the basement's cold and Radon..