Bicycle spirit level
cults3d
Allows you to measure slopes while riding a mountain bike, especially on false flats. The design is adaptable to any mountain bike as long as it has handlebars. You just have to adapt the OpenSCAD file if the handlebar diameter is different from 24mm (mine). I couldn't find this in the shops, which is why I made my own. You need three small bolts of 4mm diameter, 8mm nut, and a spirit level of 32mm diameter and 7mm thickness (I found three of them for 10€ on a famous online store, brand Taskar) I think it is very easy to adapt the OpenSCAD file for another level, a compass, ...
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