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While I'd agree that in general it's not really sensible to advise on humidities, there is a kind of basic starting point that's probably better for beginners than just going at it blind if you really have no idea where to start. While some people do well with 20% and some people do well with 60%, they're the exceptions. Most people seem to do well with humidity that's somewhere between 30-45%.
Fan assisted bators seem to do best at the higher end of that - I run my
Brinsea at 45% humidity and rarely have to adjust it. Still air bators seem to do best with a lower humidity, and some people like to do what's called a 'dry incubation' which usually means keeping the humidity just under 30%.
The best way to ensure you have the correct humidity is to buy a cheap digital kitchen scale and weigh your eggs. Developing chicken eggs need to lose about 13% of their starting weight by day 18, so if you weigh them and keep tabs on how they're progressing, you'll know whether your humidity needs to be tweaked either up or down a bit in order to get your eggs to the correct weight loss. It's simple and it's precise.
If I were you, I think I'd start with about 35% humidity and gauge progress after a week. This humidity might be too high and it might be too low, but you need to start somewhere and 35% seems like a sensible starting point to me. But don't just take my word for it! You'll have better hatching results if you read up on the incubation process and understand the purpose of humidity, so that you know
why people are recommending certain things instead of just following advice but not really understanding why you're doing what you're doing.
Brinsea's website has a FREE to download incubation handbook that explains humidity quite well. Have a look for it! And good luck!
P.S. Still air bator - temp should be 101.5 measured at the level of the tops of the eggs. Like Ridgerunner says, don't rely on what your instruments are telling you till you've checked and calibrated them for yourself. Turn your eggs at least 3 times a day for the first 18 days. Scrub your hands every time before doing this. Hygiene is very important! After 18 days stop turning your eggs and raise your humidity to above 65%. Keep the bator door/lid shut and the humidity up high. If you follow all that, you should have a better result.
