Why verify across the full measurement range rather than at a single point?

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Verifying across the full measurement range is important because an instrument’s accuracy can vary with the value being measured. Many devices aren’t perfectly linear, so gain or offset errors, drift, or nonlinearities can differ between low, mid, and high readings. By testing at multiple points throughout the range, you confirm that the instrument stays accurate under real operating conditions, including at the extremes it will encounter in use. A single-point check might show good accuracy at one value but miss errors that appear elsewhere, which could lead to incorrect readings in practice. The other statements don’t capture this essential idea: one-point checks aren’t inherently more time-consuming in the sense of ensuring reliability, the claim that mid-range values are not representative misses the need to verify all operating values, and saying the full range isn’t important is simply not true for trustworthy measurement.