My racks have their own thermostat for the flexwatt for belly heat and the tubs have an acurite in their which is held to the front of the tub with velcro. It holds good and if a snake gets under the paper and into the wire for the probe they can pull the velcro apart pretty easily. This way I can check the hot spot, ambient temp on the cool side and humidity. I prefer it this way cuz I can tell the temps and humidity of every tub just by looking at the front of every tub. I don't have to mess around with temp guns or disturb the snakes