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How do you calibrate a digital when they're not immersible in water?

I recently purchased the 1632 (with fan) and have used it for 2 hatches..both not good. I live in New England where the climate is typically dry this time of year. For my first hatch, I went by manufacturers directions, 40-50% humidity until lockdown, then 65% or so. Of 9 eggs that went into...