Why do some HTC One's vary from another?

[MONDINGO]

Why do some HTC One's vary from one another? I have 2 replacements side by side. Both behave differently especially when it comes to the light and proximity sensors. I have an HT35 which takes almost a pitch black room for the capacitive buttons to light up. When they do, they care really dim. I also have an HT36 build date of June. This One the capacitive buttons come on almost all the time in a dim room. Does not have to be pitch black. And they are also much brighter and nicer to see at night. Not sure why some vary to one another.. Not sure which on to keep.

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[Scott Kenyon]

That wouldn't be a dealbreaker for me, but I'll try to answer this as best I can. During manufacturing, there are tolerance levels. Anything falling into "acceptable" tolerances will be allowed to be sold. Every device doesn't have to be exactly the same in regards to sensor function, just within a tolerable level. Further, they don't QC every phone. That would be way too expensive and time consuming. They do a handful from a lot and then allow the lot to be sold based on that. This is why within batches of phones, us users will sometimes get a bad handset.