What do you know today that you didn't know yesterday?

[Angrboda]

another thought is a oven or covered grill is close to being a faraday box.  wifi reception might be iffy.

It's Bluetooth, not WiFi. A grill appears to be the worst case. That's a common complaint. However, there's an app so you can link your monitoring device to another over WiFi, so even though the range from the grill to the first device is not great, only one device needs to be that close. Range when dealing with an ordinary oven appears to be much better.