These digital humidity gauges were two/$6 on Amazon. They are remarkably accurate. They agree with each other and within 1% of our digital thermostat. I used one in the box where I store my CD-printer filament with desiccant. It went down to 10%, which is the expected max you can pull down humidity with the desiccant at room temperature, so they definitely react to a change in humidity.
I mounted one in my case between the bow holders. Harder than I thought as that part of the case is 1/8" ply, not foam. Used a fine Xacto blade and the a Dremel to clean it up. Since the bezel on the gauge only has about 2mm overhang and I figured the hole would come out too neat and there might by fuzz on the cloth around the edges, I 3D-printer a 10mm wide 1mm thick bezel to add around it. The gauge is a tight fit and presses in snug. Battery should last 9-12 months so I'll have to pull it every once in a while to replace the battery.
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