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John,
yes, I've seen that type of DIY info. But it is still interesting to me that there is still no "official" spec. I'll have to look again but I think there is a spec. for A/C. E.g. if you lost your first tester you could buy another, from the same or different mfgr., and continue taking readings.... not true with automotive testers.
I guess not a real big deal but curious, to me at least.
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