1.2.11-2 Location of Zero

When check-reading positive and negative values on rotary meters (circular displays), the zero or null position should be at 12 o'clock or 9 o'clock.

Additional Information:
With a matrix of circular displays, deviations from a 9 o'clock null position are easily detected in check reading. Zero should appear at the 12 o'clock position on multi-revolution dials.