Originally Posted by sourland
I would run a calibration/check on both the temp and humidity gauges/sensors.
your welcome to all my notes here..... and below is a paste from them http://www.backyardchickens.com/a/hatching-eggs-101
CALIBRATION! YES! It’s IMPORTANT!
Calibrate the thermometer/s you are using for your Incubator. I use 3 thermometers! You need to make sure your thermometer is reading correctly, Even one degree may cause serious problems with your hatch! A simple method without specialized instruments and knowledge is to compare your thermometer/hygrometer with other devices. If your thermometer (or the one you compare it with) goes at least from 0°C to 100°C you can also calibrate it with crushed ice. The thermometer should read 32 degrees in a mixture of crushed ice and a little water. If it reads, say, 30 degrees, then you can either adjust the thermometer until it is correct (if the style of the thermometer permits adjustment), or else you will at least know your thermometer reads 2 degrees too cool and adjust your thinking--and your incubator--accordingly.
More information on Calibrating your thermometer/hygrometer ~
Probe thermometer & water weasel (Water Wiggler, Water Snake) found on Amazon or Ebay make for EXCELLENT internal temp guides! The perfect internal temperature of an embryo is 99.5 degrees. If you can't find a water wiggler you can make your own with ziplock filled with water folded in half and insert the probe in the center middle.
Examples of thermometers and hygrometers
I personally like to keep a digital one that also keeps track of “highs and lows” along with 2 incubator thermometers AND a PROBE! It depends on how scientific you plan your hatch!
More Important than make/model is CALIBRATION.
It NEEDS TO BE SPOT ON!