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.
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