# The Weights and Measures (Local and Working Standard Weights and Testing Equipment) Regulations 1986, Schedule 2


TABLE 1
IMPERIAL SYSTEM Avoirdupois weights
Limit of error in milligrams
Local or working standards of—
Local standard
Working standard
56 lb
400
1250
28 lb
200
650
14 lb
100
320
7 lb
50
160
4 lb
30
90
2 lb
15
45
1 lb
7
20
8 oz
3
10
4 oz
2
6
2 oz
1
3
1 oz
0.8
2.5
1/2 oz
0.7
2
1/4 oz
0.5
1.5
1/8 oz
0.5
1.5
1/16 oz
0.4
1.2
1/32 oz
0.3
1
50 lb
350
1100
20 lb
150
450
10 lb
70
220
5 lb
35
110
TABLE 2
Weights expressed as multiples or fractions of 1/7000 lb
Local standard of—
Limit of error in milligrams
100
0.53
50
0.44
30
0.40
20
0.33
10
0.27
5
0.22
3
0.20
2
0.17
1
0.13
0.5
0.11
0.3
0.10
0.2
0.09
0.1
0.06
0.05
0.06
0.03
0.06
0.02
0.06
0.01
0.06
TABLE 3
Troy weights
Local standard of ounces troy—
Limit of error in milligrams
500
250
400
200
300
150
200
100
100
50
50
25
40
20
30
15
20
10
10
5
5
2.5
4
2.0
3
1.5
2
1.0
1
1.0
0.5
0.7
0.4
0.6
0.3
0.6
0.2
0.5
0.1
0.4
0.05
0.4
0.04
0.3
0.03
0.3
0.025
0.3
0.02
0.25
0.01
0.22
0.005
0.18
0.004
0.16
0.003
0.15
0.002
0.13
0.001
0.11
TABLE 4
METRIC SYSTEM Metric weights other than carat (metric) weights
Limit of error in milligrams
Local or working standards of—
Local standard
Working standard
20 kg
300
1000
10 kg
150
500
5 kg
75
250
2 kg
30
100
1 kg
15
50
500 g
7.5
25
200 g
3.0
10
100 g
1.5
5
50 g
1.0
3
20 g
0.8
2.5
15 g
0.7
2.2
10 g
0.6
2.0
5 g
0.5
1.5
4 g
0.5
1.5
3 g
0.4
1.2
2 g
0.4
1.2
1 g
0.3
1.0
500 mg
0.25
0.8
400 mg
0.25
0.8
300 mg
0.25
0.8
200 mg
0.20
0.6
150 mg
0.20
0.6
100 mg
0.15
0.5
50 mg
0.12
0.4
20 mg
0.10
0.3
10 mg
0.08
0.25
5 mg
0.06
0.20
2 mg
0.06
0.20
1 mg
0.06
0.20
TABLE 5
Carat (metric) weights
Local standard of— C.M.
Limit of error in milligrams
500
1.5
200
0.93
100
0.80
50
0.60
20
0.47
10
0.40
5
0.30
2
0.23
1
0.20
0.5
0.15
0.25
0.12
0.20
0.11
0.10
0.10
0.05
0.08
0.02
0.06
0.01
0.06
TABLE 6
Test weights
Imperial weight
Limit of error
Metric weight
Limit of error
11200 lb
500 g
4480 lb
200 g
5000 kg
500 g
2240 lb
100 g
2000 kg
200 g
1120 lb
50 g
1000 kg
100 g
1008 lb
50 g
500 kg
50 g
560 lb
20 g
250 kg
20 g
448 lb
20 g
200 kg
20 g
224 lb
10 g
100 kg
10 g
112 lb
5 g
50 kg
5 g

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Source: https://www.legislation.gov.uk/uksi/1986/1685/schedule/2 (the official version)
Page: https://openlegislation.uk/weights-and-measures-local-and-working-standard-weights-and-testing-equipment-regulations-1986/schedule-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.