Spirit Level Tool

As an athletics referee, I want to check if stands and high jump/pole vault bars are level. There are tools available, but they are too bulky for my taste, so I made my own..

I tore apart a cheap spirit level and salvaged the vials from it. For this model, I only used the rectangular one. It's 14,5 x 14,5 x 40mm.

Just add some small nails for hinges and you're good to go. It's not perfect yet, but it does the job for now. If you make one, please share the results!