any of these will work for ur incubator. Or u could use a regualr thermomtre. any thermomtre will do actual.. in fact even those digital meat type thermomtres would work.
as for hygrometres i'll put them in another post in this topic for u i'll have to find the links.
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The Brinsea Spot Check is the best thermometer I have seen. Its digital readout will show Fahrenheit or Celsius and its resolution is 1/10 of a degree. By the time you buy two or three or more cheaper thermometers to average together, you could have bought a Spot Check. You can order it direct from Brinsea or buy it on e-Bay at about the same net cost of $27, which seems too high considering it's made in China, but it does work well.
As to hygrometers, there is a way to calibrate them, so I think most any one will do. Wal-Mart and Harbor Freight both have combo thermometer/hygrometer units that are cheap.
Note that I am not an experienced egg hatcher, but I have spent a fair amount of time studying thermometers, thermostats, and related electronics (and I did sleep in a Holiday Inn once.)