These are the best hygrometers for incubators!
https://www.amazon.com/Goabroa-Hygrometer-Thermometer-Temperature-Fahrenheit/dp/B07QC7JRDP/ref=sr_1_3?crid=SPASQ6242FYP&keywords=incubator+hygrometer&qid=1667870829&sprefix=incubator+h%2Caps%2C445&sr=8-3