Calibration Block Set

A fitted case of reference blocks with certified density, reflectivity, acoustic response, and trace composition. Survey crews use them to prove an instrument is measuring the world rather than its own bad mood. Each block has a handling history and chipped corners invalidate specific tests. The set looks boring on a manifest, right up until a disputed claim depends on whether yesterday's scanner was honest. Praxis recommends a bench check after hard use; skipped certificates are cheap until an insurer asks for the last valid one. A used Calibration Block Set sells on its latest calibration certificate. Without one, port inspectors treat every reading as opinion and every signed survey as somebody else's liability.