I am using the probes to check the internal temps of the meat. Right now, I am just trying to figure out if the probes are giving a accurate reading. That is the reason all 4 probes are in the grill. I would assume that all probes placed right next to each other would give the same reading, but they don't. They do read the same in boiling or ice water and seem to be dead nutts on. While cooking, I use one probe inside the grill to check grill temp, and one probe to check meat temp. The thermometer in the lid doesn't match the probes by a big margin. I don't need precision accuracy, but if I can figure out what the lid thermometer needs to read, then it would make my chances of having repeat results more likely. Probes are reading correctly in boiling water and in ice water, but seem erratic when inside the grill. 1 or 2 degrees is close enough, but 10 or 15 degrees bumfuzzles me. Right now, my meat tastes great, it just isn't the pull apart BBQ I am looking for and I am suspecting I am not getting temps the required temperature for the pull apart. My cooking times also seem to be a lot longer than others cooking similar size portions, which shouldn't be if everybody is cooking to the same temp. I don't know what I am doing, but I am eating well trying to figure it out.