Which reading is closest to 6.3?

Erklärung

The distances are 0.002 for 6.298, 0.03 for 6.27, 0.09 for 6.39 and 0.27 for 6.03, so 6.298 is uniquely closest. Choosing 6.03 by matching the digits 6 and 3 ignores the place occupied by the 3.