Funk was relevant for me because of the price difference was too powerful for me. I have chosen a solution via WLAN. (Old Android phone with installed "IP Camera App" and access via Wi-Fi from your iPad)
The sensor should not be immersed in water, as this sensor technology could get hurt. I always clean them only with a damp cloth and detergent.
When the burners ignite (piezo) you should unplug the sensor from the thermometer pull, otherwise the thermometer would collect a power surge. Display flashes this uncoordinated ..
Conclusion: buy, if you can do without wireless connection and want to simultaneously monitor nuclear and grill temperature.