OK--just realized that you are hatching duck eggs and they do require a higher humidity.
All hygrometers (that's the humidity sensor) should be calibrated (checked for accuracy) so you know that they are reading the humidity correctly. For me, it seems like the digital ones (show an actual number you read on an screen) are less accurate than the analogue ones (they have a dial that you read) and can be off by a lot.
To calibrate a hygrometer, you can use a wet bulb method which I find harder, or a wet salt method which is much easier to use. In a nutshell, you are dampening salt and putting it in a container (I use a shot glass) along with the hygrometer you are testing into a sealed chamber (I use a 1 gallon zip top bag). Wait 12 hours and read what the hygrometer says it thinks the humidity should be. It should read 75% humidity. If it reads lower then you know it is off by the difference---ie if it says it reads 45% and it should read 75% then it is off by 30 percentage points at that humidity. Here is a link to the wet salt method: http://www.cigarpass.com/calibrating-your-cigar-hygrometer/
I did not have luck getting the humidity up with anything in the toughs themselves. I found that putting sponges in vertically held in place with plastic needlepoint canvas that I cut down to size sandwiched between two bars spaced just right was really effective. A sponge sandwich: bar-needlepoint canvas-sponges-needlpoint canvas-bar. I use this at lockdown and created two chambers but you could just as easily put it off to one side and have it on an edge. I fill a 60 cc catheter tipped syringe (you should be able to get them at feed stores) with water so I can squirt the water in quickly, but I am sure you could use a water bottle and pour slowly so you don't get water on the eggs.
Here is a photo at lockdown. I have another cross-mesh in the bottom chamber--ignore that. The main one is the one to look at. There is one sponge that is cut in half lengthwise with the pieces set diagonally and then another 1/4 size one in the middle. The sponges seem to stay wet about 2 days then need to be wetted. The main problem is that it takes up about a row of space so you can't load it up fully.
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