I do not have an idea what your budget is, but order an actual thermostat offline, check out Herpstat, I can't remember but go to LLLreptile.com to grab one of theirs. They are pricey but they get the job done well.
If your on a tight budget, check out this
Hydrofarm MTPRTC Digital Thermostat For Heat Mats:Amazon:Patio, Lawn & Garden
Hydrofarm t-stat, that's what I use and it works really well.