Can I use a ranco thermostat for an incubator? I have heard that people have used this with success. I know you are all going to say that you should get a proportional thermostat and dont get me wrong, I would LOVE to get one for my incubator, but I don't have that much money for a herpstat or a helix. And I rather use a proportional than ranco. For the Ranco thermostat, how much will the temperature go +/- from the set temperature? I have the hydrofarm on/off thermostat for my snake rack and that goes like +/- 2 degrees from the set temp.