From aliexpress, I ordered years ago for $ peanuts. I guess I am set for life. (fill probes not in this picture but could not find quickly)
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Believe it or not I participate in other activities that are just as bad or worse when it comes to lack of standards and compatibility between mfrs. Or worse, they spontaneously change the standards for no apparent reason"One probe to rule them all probably makes too much sense to ever happen."
but if companies did that they could not charge $$ to replace a simple fill probe , case in point AA S510 twist on thing . AA might have changed that now ?