Accu-Rite digital thermometer/hygrometer combo

I am getting one of these for my bps, but I am not sure which model to buy. There are several and the caresheet indicates one that has probes to test both the hot and cold side at the same time. Which model is that?

Thanks,

Not sure of model number but purchased mine at walmart. 1 probe for hot side. The unit you put on cool side and it has internal sensor to measure temp. It also reads humidity. Cost 12$. When I first set up my rack I mounted the probe in one tub on hot side then just moved the unit to different tubs tocheck if all were consistent. Now it just sits on top of rack to keep check on heat in room