Re: Hygrometer
This is is dead accurate, lasts forever, is designed for cigars (humidors). I have three, they have all retained their calibration to within 1% across a few battery changes, and one of them is almost 10 years old.
When I first started with the hygrometer thing, I bought several consumer humidity meters, they disagreed with each other by as much as 10%. I bought the calibration kit from Amazon, and finally tried the one I recommend. They cam from the factory within 1% accuracy, and could be calibrated to no deviation (0% off). I have used them ever since, they are cheap, dead accurate, small (fits in a mandolin - or cigar - case):
https://www.amazon.com/Hygrometer-10.../dp/B000H6CZQE
Here is the calibration kit:
https://www.amazon.com/Boveda-One-St.../dp/B000A3UBLA
Edit: I don't think in terms of action WRT to humidity, a sunken top is too low humidity, a bulging top is too high. My first Taylor guitar came with little humidity brochures with pics, warnings, and humidity range recommendations for safe storage. I seem to recall that 40-60% was the recommended range, I had 70% one summer, and the top bulged, bought a dehumidifier after that. I know guys who cracked their guitars from too low humidity.
Davey Stuart tenor guitar (based on his 18" mandola design).
Eastman MD-604SB with Grover 309 tuners.
Eastwood 4 string electric mandostang, 2x Airline e-mandola (4-string) one strung as an e-OM.
DSP's: Helix HX Stomp, various Zooms.
Amps: THR-10, Sony XB-20.
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