Sensor calibration calculator

The fit treats measured as the input and reference as the target, so the line it produces is a correction you can apply directly to raw readings. Accuracy and linearity are kept apart on purpose: a constant offset has perfect linearity and is fixed by a zero adjustment alone, while accuracy prices the offset in. Hysteresis needs the same reference approached from both directions and repeatability needs repeated readings; neither is ever estimated from single points.

This is bench arithmetic, not a calibration certificate. It does not establish traceability, does not build an uncertainty budget, and does not decide adjustment order; see NIST Technical Note 1297 for that layer of the work.