Monitoring humidity in egg tub?

[CeeJay]

So what are the signs to look for? How much dimpling is too much? I noticed a little bit of dimpling in my eggs. Very TINY bumps They were laid 6 days ago. I have a probe and a hygrometer. The probe said 75. The hygrometer says 90. I am wondering if my probe is off.

The eggs themselves are the best gauges of proper humidity, they never lie. That said, I bought one of these this year, for trying out MI:
http://beanfarm.com/product_info.php...oducts_id=5704

It is not super cheap, but it's working really well for me.

Editing to clarify: Yep, the humidity is indeed taken at the probe, so the body of the thermometer can sit outside the cage/incubator/whatever. Its reaction time seems pretty quick, too.