Both my thermostat and Temp probes are stuck to the glass bottom of my Terrarium directly above where the heat mat is stuck to the under side, with substrate lightly spread over them.
This all depends on where the mat is I assume its under the glass tank. U want probes on the glass directly over the mat pinned down with something heavy. If the thermometer probe has a suck cup either take it off or make sure its far enough back that the probe is able to lay flat on the glass.
This all depends on where the mat is I assume its under the glass tank. U want probes on the glass directly over the mat pinned down with something heavy. If the thermometer probe has a suck cup either take it off or make sure its far enough back that the probe is able to lay flat on the glass.