I agree ecoearth is good. You are you using a glass tank right? I would place the thermostat probe between the heat mat and the glass. Also try and tape the heat mat down with A/C foil duct tape if you have any. I like the ecoearth because the snakes tend to have a easier time burrying themselves into it if they want to get warmer. I would also grab a digital thermometer and hot glue the probe down under the substrate in the snakes hide to moniter belly temp.
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