I'm looking for some calipers to take measurements off SUP and foils and surfboards and anything else I want to measure.

I've found surfboard shapers calipers and various engineering calipers but they don't look big enough for SUP, or are too expensive or whatever.

I am assuming all you sailboard and SUP makers have this sorted already. What are you doing for calipers? Making them? Buying them from somewhere?

I'm not after tips for using levels and squares and stuff. I've been doing that for ages. I want something convenient and reasonably accurate that won't damage or scratch whatever I'm measuring.