I use two thermostats on my Incubator, one a proportional that adjusts the power to the Flexwatt and a back up one that is on/off. In fact, every thermostat I have is backed up with an on/off Thermostat.
I've been using Vivarium Electronics, they carry both the on/off and proportional thermostats. They can be found at ReptileBasics.com. Great company to do business with.
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