Not all have a sniffer , make sure they have that to determine your mixture. Also make sure it is long enough to go past the crossover pipe to get a good reading. If you still have baffles or a cat then you can't put the probe that far in. He should also monitor head temperature. If you want to make adjustments be sure to tell him that, some will put the bike up there do 3 runs and that's that. Just hand you the paper read out.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!