Come on Joans, put on your reading glasses and follow the thread.
As Dominic correctly pointed out "he was using that as an example. There are plenty of other devices or testers we all use "
This isn’t about AFCI, it’s about having back up plans.
Which is why I said, very clearly
"In general, I have back up of almost everything. "
Keywords being “in general” (i.e. general inspection equipment, not limited to AFCI) and “almost” (meaning, no, I don’t have a back up of every last tester).
But since I do pay you in imaginary cookies to give me a hard time, I’ll answer your question, even though it has NOTHING to do with my response:
Up unit 6 months ago, Los Angeles County only required AFCI if the receptacle was brand new, and specifically exempted all panel upgrades from having to follow the NEC recommendation on AFCIs.
As of 6 months ago, Los Angeles County dramatically altered their language but specifically still exempted all panel upgrades if the new panel is within 6 feet of the old panel (why 6ft? I don’t know, do arc faults care about length? I doubt it).
Given 98% of the homes I inspect were built between 20 to 100 years ago, I rarely ever see AFCI breakers installed.
And the few times I do actually see these almost near-mythical breakers, I test them at the breaker at the panel by pushing the test button with my finger. Thankfully, I have 10 fingers, so I have 9 back up fingers should one finger become unusable during an inspection.