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Good luck. It's handy to write (-6%) on a piece of masking tape and stick it right to the incubator as a reminder to subtract 6 for true RH. Or 7, whatever, a percent here or there doesn't matter. I've seen gauges off by as much as 15%.

Not sure how much it matters but I use a paste not a slurry of salt. Add drops of water until saturated. I also allow a pillow of air when zip sealing bag as to not obstruct the gauge. I see you did this yesterday. Did it make any difference to use a slurry of salt? The environment in bag...