The ShadeVision calibration plaque is the white ceramic tile that is on the back portion of the docking station. When the instrument is docked with a tip on, the tip will be flush against the calibration plaque. Because the instrument measures the calibration plaque several times during calibration, it is critical to ensure that the plaque is perfectly clean with no contamination, residue, fingerprints, or smudges.
Clean the calibration plaque using a damp, lint-free cloth and wipe it dry with a second lint -free cloth. Make sure no residue remains on the plaque. Never use strong cleaners or abrasives as they can damage the calibration plaque.