I still look at them when installing them to make sure they haven't been dropped, despite the cardboard or clear plastic protective sleeves.

Msammy is thinking of single electrode plugs, and not even all of those can be gapped by the installer, as the insulator will break on many of them if a feeler gauge is inserted.

I still have my feeler gauges in my roller cabinet though. You never know when you might need to set the points on a classic.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue