I bought this after both the probes of my et73 died. It was cheaper than buying replacement probes and requires only one set of batteries and should have better range, I haven't used it in the smoker yet, but took it out of the box to test it. Temperatures were within 2 degrees of each other and of the correct temp when tested in boiling water. Android App was easy to find but would not pair unless you enable location permission - can't see why it needs this permission, but it just wouldn't pair unless enabled. Otherwise it worked just as expected. reviews of the app complain about it losing bluetooth connection silently, making it useless for monitoring, but for me it alarmed when I turned off the device and it lost connection. This alarm can be turned off. Hopefully battery life is good enough for a 24h smoke, haven't tested this yet.