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The calibration of the Goldmann applanation tonometer should be checked at specific pressure points to ensure accurate measurements of intraocular pressure. The correct setting for calibration involves using values that span the lower and upper ranges of intraocular pressure typically encountered in practice. The choice of 0, 2, and 6 is appropriate because these values include a representation of both low and moderate pressures.

Calibration at these intervals allows for verification of the tonometer's accuracy across a range commonly found in patients, helping to ensure that the measurements taken during eye examinations are reliable. This is crucial for diagnosing and managing conditions such as glaucoma. The other choices do not provide a suitable range or may skip critical values that are needed for reliable performance assessment. Thus, the selected values offer a balanced approach to effective calibration.