COOLANT REFRACTOMETER CALIBRATION: CHECK THE ZERO, THEN CHOOSE THE RIGHT SCALE Vehicle / sample source / known coolant product / uncertainty: Instrument model / manual / required conditions: Reference liquid / expected indication / observed indication: Adjustment if required / completed reference check: Selected glycol scale / output type / units: Original sample observation / repeat and reason: Applicable vehicle or product requirement / comparison status: Established result / unresolved question / next authorized check: Follow applicable vehicle, product and instrument instructions. Illustrative values are not specifications or evidence of completed work.