I like them they aren't to bad to wire and last for years .I used one for years in my old Brower just as a hatcher. I hatched hundreds of chicks with it . But something with a .1 or.2 degree on/ off is much more preferable in a incubator . I'm not really sure what the on /off range of a wafer is never checked it . I got rid of all of them and changed everything to digital .
is there a better grade digital that you like ?
Because yeah... the wafers haven't lasted all that long for me.