- Thread starter
- #11
- Jun 20, 2008
- 40
- 30
- 97
What's going on is the salt environment you created takes so much time to stabilize. It's why you wait 6 hours or until the humidity reading is steady.
A salt test is used to calibrate your hygrometer. Not many are reading true and I've seen them off as much as 15% RH. It doesn't mean the hygrometer is unusable it only means you add or subtract however much it was off in the salt test to get true readings. For example if your reading after 6 hours was 82 then 75-82= -7. -7 is the calibration, you'd always subtract 7 from your reading to know what the true RH is. There is no need to use another hygrometer. One is all you need with it's calibration # written on masking tape and fixed to incubator as a reminder.