[Coco] Hex calculator (off topic)

[Chester A Patterson]

Hi. Does anyone know if there was ever a Hexadecimal calculator and
where to get one?
I know a spreadsheet is great for this but sometimes my job requires to
do some simple boolean hex math in the field, on the plant floor, not
the place for a PC, not even a laptop (unless it's
dust/water/petro/food/scalding/freezing proof). A calculator of sorts
would be great.