Mine is placed inside the tub on the cool side so I can see it from the outside. I run the probe to the back to measure the warm side. Honeywell sells a central display with up to 3 wireless probes to measure temp/humidity, but that runs you upwards of 80 bucks. Just get the $12 lowes acu-rite, put it in one of your stacked tubs and enjoy the snakes.