The infrared may work for Gordon, but I would still be leery of using one. That will give you only the surface temperature of the mash. You may have a cold spot 8 inches down and not be able to detect it. Gordon's stirring routine is probably consistent enough that this measuring system works for him. I prefer the long stem probe precisely because I can check the temp at various depths and locations.
I agree about the cable probes. I have two dead ones here that attest to the problem of getting them wet. I now have a couple high priced timers for the brewery.

Wayne