Inkbird Bluetooth BBQ dual probe thermometer.
I've had one of these for over a year and they're awesome!
You can measure the temp & set alamr for for two different foods (e.g. chicken & steaks) or different parts of a roast at the same time or just steaks because the missus like well done & I like medium.
It has IOS/Android app so you can connect & get instant reads, set desired temps, alarms for each probe, etc Or you can just read off the display.
They're fairly robust (I have a habit of killing my probes, but these have been fine).
The two probes are great for cooking steaks to different temps (e.g. rare & med-well done Or monitoring a roast which is uneven (e.g. whole legs of lamb)
Perfect fathers day prezzy if he likes the BBQ.
They're about $36 on Ebay.
Amazon Prime members get free shipping.
Also have one of these.
We haven't had a single overcooked/undercooked piece of meat since purchasing. Absolutely fantastic!