I have the iGrill2, which accepts 4 probes. the unit comes with two, with others available as accessories. I've got a pit probe and two meat probes and use all three rarely. It's about 2-1/2 years old now and still works fine. The probes are stout and the cables are durable. Bluetooth range is subject to all the Bluetooth vagaries. What's nice about it that it connects to an iPad and will show you a line graph of each probe over the length of the entire cook. I do briskets and butts overnight and when I get up in the morning, I can see how the cooker held temp overnight and adjust accordingly if there was an issue. About $65 on Amazon with 2 probes.
Jeff