# The Non-automatic Weighing Instruments (EEC Requirements) Regulations 1993, Paragraph 2: Units of mass


Accuracy classes
2.1. The following accuracy class have been defined:
I
special
II
high
III
medium
IIII
ordinary
The Specifications of these classes are given in Table 1.
Table 1
Accuracy classes
Minimum capacity (Min)
Number of Verification scale intervals
n=Maxe
Class
Verification scale interval (e)
minimum value
minimum value
maximum value
I
0,001 g ≤e
100 e
50 000
—
II
0,001 g ≤e ≤0,05 g
20 e
100
100 000
0,1 g ≤e
50 e
5 000
100 000
III
0,1 g ≤e ≤2 g
20 e
100
10 000
5 g ≤e
20 e
500
10 000
IIII
5 g ≤e
10 e
100
1 000
The minimum capacity is reduced to 5e for instruments in classes II and III for determining a conveying tariff.
2.2. Scale intervals
2.2.1. The actual scale interval (d) and the verification scale interval (e) shall be in the form:1 × 10k, 2 × 10k, or 5 × 10k mass units,
k being any integer or zero.
2.2.2. For all instruments other than those with auxiliary indicating devices: d = e
2.2.3. For instruments with auxiliary indicating devices the following conditions apply:
e = 1 × 10kg
d < e ≤ 10d
except for instruments of class I with d < 10−4g, for which e = 10−3g.

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Source: https://www.legislation.gov.uk/uksi/1992/1579/schedule/2/paragraph/2 (the official version)
Page: https://openlegislation.uk/non-automatic-weighing-instruments-eec-requirements-regulations-1993/schedule-2/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.