Instruments can be recalibrated or reinterpreted; the same physical behavior is compatible with Euclidean geometry plus correction factors, making geometry underdetermined by measurement.

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Calibrated/recalibrated(as used in philosophy of science): Adjusted or fine-tuned so that an instrument (like a ruler or thermometer) measures things accurately; recalibrating means adjusting it again.
Correction factors(as used in philosophy of science): Adjustments or extra calculations you add to raw measurements to account for errors or distortions in your instrument.
Euclidean geometry(as the standard geometric system for comparison): The familiar geometry taught in most schools, based on flat surfaces where parallel lines never meet and the angles in a triangle always add up to 180 degrees.
Underdetermined (by measurement)(as used in philosophy of science): When multiple different theories or explanations can all fit the same experimental data equally well, so measurements alone can't tell you which one is actually true.

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