Discussion
Checking an instrument's zero after a set of readings as well as before is worth doing because
Answer: A
Correct answer: a drift during the readings would otherwise go unnoticed
Checking the zero at both ends brackets the readings: if it has moved, the readings taken between are suspect and can be corrected or repeated. Checking only beforehand assumes stability over the whole session, which for a sensitive instrument warming up or in a changing ambient is not a safe assumption.
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