I think you are confusing thermometers and thermostats.
A thermometer measures temperature
A thermostat uses a temperature probe to vary the output going to a heating/cooling system.
Both are necessary.
You need a thermometer on each side of the cage so you know the temperatures of each.
You need a thermostat for each heat source you use. The probe for the heat source needs to be attached directly to the heat pad. I use hot glue for this. Just don't apply glue to the probe itself as this will alter readings. Do not ever use foil tape as it can ack like a heat sink and alter probe readings.
So get one of the thermostats I put links to above. Unregulated heating pads can and will get up to 150+ degrees. This is hot enough to kill your snake.
Then get one of these. This is a good digital thermometer with a probe. You need a probed thermometer because heating pads do not change the air temperature in the tank. All they do is heat up the floor.
This thermometer is sold at Walmart for $12 and will measure your hot side temlerature, cool side temperature, and humidity.
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