I posted earlier that I had misplaced my thermometer probes. I was able to find a replacement for my Maverick ET901 from Maverick, but I've struck out on finding a replacement for the Acu-Rite 724 that I have. In looking around, it occurred to me that I had probably used the probes for these 2 thermometers interchangeably because I don't remember marking them in any way and both use the same mini plug to connect to the electronics. I don't recall having any questionable readings from these thermometers (unlike the built-in on the MES40); and, I suppose it is possible that I never accidentally used the wrong probe on either unit; however, this line of thought makes me wonder if there is any meaningful difference in the construction and function of the wires and probes. Does anyone know the answer to this question? Can you point me to a web page? My search fu is not strong tonight. Also, if anyone can point me to a source for a replacement for the Acu-Rite, I'd me much obliged. I see that I can buy a whole new unit for $20 plus shipping, so the price has to be right. For those of us who have multiple thermometers, it would be great to know if it is important to their function that they use the correct probe.