3.3.3 - Instrument calibration

Discuss calibration of instruments, including whether an instrument reads zero before measurements are made.

Use - instrument calibration to connect the rule to the data and decision in the question.

This matters because - instrument calibration determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply - instrument calibration to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: - Instrument calibration is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.