The only thing I can think of is an extra ambient probe, perhaps. It's good to use if you want to measure temperatures across different areas of the grate. Again, not needed but good to have!
A lot of people, myself included, use the probe spools from Thermoworks.
Prolong the life of your probeThe design and size is optimized to prevent pressure on the cable and eliminate kinking. Store them where you cookUsing the magnet on the back, keep them handy on the side of the fridge, grill, or smoker. Keep things organizedThe silicone spool probes come in four...
www.thermoworks.com