Division 2.2 The accuracy classes are supplemented by a factor (x) that quantifies the maximum permissible standard deviation as specified in point 4.2.
United Kingdom
The manufacturer shall specify the factor (x), where (x) shall be ≤ 2 and in the form 1 × 10k, 2 × 10k or 5 × 10k, where k is a negative whole number or zero.