A possible way to estimate water content in filaments

@Mzip For desiccant in a dry box, how are you deciding when to change it? When it changes color? Or when the RH% inside reaches a certain number? If the latter, what number, and how does one decide what a good number is?

Actually, come to think of it, I haven’t even taken note of what rh% a regular silicon desiccant changes color from orange to green. I suppose for your purposes if it’s below 20%, then color change is a good enough indicator?

Since solid answers have been hard to come by, my bias has been toward overkill solutions that are guaranteed to work, but if I knew more, I could maybe be smarter in picking more efficient solutions.