http://www.reptilesupply.com/product.php?products_id=75

Is this the reptitemp 500r Ive heard some people here use? It says up to two UTH's, which is what I need it for, but does it have two probes? Will one probe work since the UTH's are the same size? And the probe goes between the pad and the tank bottom, right? Does it need to be in the middle?