A little off topic...Just a word of caution, be very careful when cleaning the ET-733 probes. I have always tried my best not to let water hit the end of the probe where the wire goes in. I even hold that part with my hand so I know where to stop with the sponge and where not to get water...went to use my ET-733 over the weekend and one of the probes read 'LLL'...looked in the manual and it means one of two things, either the probe got too hot (it's only seen 325 degrees once) or water got into the inside of the probe and ruined the internals. Per the manual, the latter happends about 98% of the time and nothing can fix it. Had to order a new probe. The device only has a 90 day warranty...
What gets me is that there is even a silicone sleeve that is compressed into the end to help keep out water but guess it didn't work. I got the thermo Christmas 2013.
Back on topic...
For my grommet, I only using the slit, for which I insert the probes for the Maverick ET-733 along with my Stoker ATC probes. Don't use the small hole for anything.
Dave