# The Non-automatic Weighing Instruments (EEC Requirements) Regulations 1995, Paragraph 2: Units of mass


Accuracy classes
2.1 The following accuracy classes 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
Class
Verification scale interval (e)
Minimum capacity (Min)
Number of verification scale intervals
n=Maxe
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
500 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 × 10k g
d < e ≤ 10 d
except for instruments of class I with d < 10−4 g, for which e = 10−3 g.

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Source: https://www.legislation.gov.uk/uksi/1995/1907/schedule/2/paragraph/2 (the official version)
Page: https://openlegislation.uk/non-automatic-weighing-instruments-eec-requirements-regulations-1995/schedule-2/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.