If you put in a 1/2 cup, the humidity should be fine until hatch-then you just need to add more.I have one I got from amazon. I’m in my first hatch with it. On day 8 now. It does not monitor humidity so you need some kind of gauge for that. I have a wireless indoor/outdoor temp & humidity gauge. It is Celsius only so this temp gauge helps. You can set it to have an upper and lower range of temp. I’ve had no trouble keeping it at 99-100. 3/4 of my eggs are doing fine so far. Humidity is tricky to keep constant - putting water in little cups in the bottom rather than just pouring it in seems to help.
If you put in a 1/2 cup, the humidity should be fine until hatch-then you just need to add more.
I'm from northern Indiana but I also run hatches with higher humidity- I had two hatches going and the incubator with my hydrometer (my cheap, foam little giant) hatched none and I trusted the JAnoel to hatch and regulate its own humidity and it hatched well. I do suggest taking caution during hatch time and I'm sure the humidity can vary a ton based on your location.DH got me a Janoel 12 for Valentines Day, he knew I wanted an incubator. I was researching the Janoel 12 & Incuview, wanted the Incuview but guess he decided smaller the better. The eggs I wanted to hatch became unavailable so have yet to try it out. I ran it, temp holds good but the hygrometer I purchased runs higher than is.
Where is your location? I've found out that the ambient temp affects the internal humidity. When I was testing & added 1/2C water, humidity was high so I then removed the water & ran it dry, humidity reading then 30% - 45%. It's been humid here, so I'm thinking what I read maybe correct.