heres what I use. You plug the heating mat into the port in this device, then plug the whole device into a power outlet. This is what will regulate your mat!
there is a probe, the little thing that has a suction cup on it. What I do is I put the probe right in between the tub and the mat to get a reading of what the mat itself is heated up to. (You can just slip the suction cup off and toss it)
There is a "set up" button where you can make a target temperature. I keep my "target" at 95 degrees because through the plastic and the substrate that makes the warm spot around 85-90. You'll be able to check that with a temperature gun!
The way it regulates is if the mat goes above your "target" the regulator will turn the heat mat off to cool down, and it'll turn it back on again when it needs to reach the target temperature again. I'd say get one of these as soon as you can.
Thanks I will get one as soon as I can I will have to see how much I have after paying bills and getting my car repaired