Ah, beta, zero error is when your measuring instrument doesn't start from true zero—it's either ahead or behind. This error gets added or subtracted from every single reading in your table, so your entire data set is shifted. I know this too well because in our unit, we once scrapped a whole batch of piston rings. The workshop's old micrometer had a positive zero error, and every piece was machined undersize. My chai went cold explaining that to the owner, yaar.
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