If the millimetre reading from the level probe is not matched to an accurate volume table, station stock never reconciles; the shortfall grows and its source stays hidden. We derive the mm-based volume-to-level table of underground and aboveground tanks by on-site measurement, verify tank geometry, and map the table onto the automation probe. The goal is a single equation; measured stock = litres sold = accounting record; kept intact through periodic re-verification.
Millimetric calibration tables for station and facility tanks, verification of level gauging systems, annual periodic checks.