This will only be of interest to fellow canners out there. A super simple but handy tool for measuring the air space at the top of jars for canning. I wanted something that would sit on the edge of the jar as I’m filling it, vs having to hold the gauge with one hand while filling. Works with regular and wide mouth jars.
I cut the orange one from 1/4" acrylic I just picked dup from Tap Plastics and haven’t dialed in the GF settings yet (as you can see from the scorch marks).
edit- cut the red line, score the blue and black