Tactical calculator?

Coltsp1

Private
Minuteman
May 6, 2019
66
17
Tactical calculator may sound goofy, but I have some perimeters that I want. Lightweight., waterproof, solar, and battery, lit screen and buttons on switch, on and off on switch or button I may be asking too much.
 

I think you'd still have to know the formula for the perimeter...
 
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