x2 for this, a thermostat is a MUST for heat pads. Snakes have been badly burned/have died because of improper use of heat pads.
Also, I really wouldn't use the dial temperature/humidity gauges they tend to be horribly inaccurate. You can get a good digital one from home depot for $10.
Another question based on your previous threads, is this enclosure of yours for just one of your two snakes? Or are you putting them both in the same enclosure again? Again that's really not the healthiest option for them.