Product review (4 stars): Closest to GQF hygrometer but cheaper from other vendors.
I ordered 3 different hygrometers to use in my tabletop incubators. This one is a lot bigger than the Avianweb hygrometers but those are so far off they killed my turkeys. They pipped 4 whole days early and some died in the shell before I increased the humidity 3 days before scheduled hatch. Better to put this model in an egg cup and incubate one less egg than lose a bunch of eggs. When I ordered a 1502 cabinet incubator from GQF, I ordered their more expensive hygrometer, and this model was closest.  Currently $9.89 from another vendor with free prime shipping.