http://www.legislation.gov.uk/id/uksi/1963/1710

SCHEDULE 2

PART IPRESCRIBED LIMITS OF ERROR ON THE TESTING OF WEIGHING INSTRUMENTS

1

Subject to paragraphs 2 and 3 of this Part of this Schedule, the prescribed limits of error for weighing instruments shall be those specified in Parts II to XI of this Schedule:

Provided that in the case of any weighing instrument of a capacity not so specified, the prescribed limits of error shall be the amounts proportionate to those so specified for an instrument of the same type, class or description.

2

In the case of any weighing instrument which weighs in units of the metric system and for which no limits of error are specified in terms of those units, the prescribed limits of error shall be the amounts in terms of metric units equivalent to those specified in terms of imperial units in the relevant Part of this Schedule with respect to an instrument of the same capacity, type, class or description.

3

In the case of any weighing instrument of the self-indicating or semi-self-indicating type, the prescribed limit of error, in excess or in deficiency, shall be either—

a

the appropriate amount specified in the relevant Part of this Schedule for the instrument concerned, or

b

the amount corresponding to one half of the smallest interval between consecutive graduations on the scale or dial of the instrument,

whichever is the less.

PART IIBEAM SCALES AND BALANCES

1

Beam scales marked “Class B”.

Capacity of instrument	Weight to be added to test sensitiveness when fully loaded		Error in excess or in deficiency when fully loaded
Upon passing as fit for use for trade	In relation to the obliteration of stamps	Upon passing as fit for use for trade	In relation to the obliteration of stamps
1 ounce	⅕grain	1⅗grain	⅕ grain	1⅖ grain
8 ounces	1 grain	3 grains	1 grain	2 grains
1 pound	1 grain	3 grains	1 grains	2 grains
2 pounds	1½ grains	4½ grains	2 grains	4 grains
4 pounds	3 grains	9 grains	4 grains	8 grains
7 pounds	4 grains	12 grains	6 grains	12 grains
10 pounds	6 grains	18 grains	9 grains	18 grains
14 pounds	8 grains	24 grains	12 grains	24 grains
28 pounds	15 grains	45 grains	22 grains	44 grains
56 pounds	25 grains	75 grains	40 grains	80 grains
112 pounds	1½ drams	4 ½ drams	2 ½ drams	5 drams
224 pounds	2½ drams	7½ drams	3½ drams	7 drams
Above 2 hundredweight	Add ½ dram for each hundred-weight of capacity	Add 1½ drams for each hundred-weight of capacity	Add 1 dram for each hundred-weight of capacity	Add 2 drams for each hundred-weight of capacity

2

Beam scales marked “Class C”.

Capacity of instrument	Weight to be added to test sensitiveness when fully loaded		Error in excess or in deficiency when fully loaded
Upon passing as fit for use for trade	In relation to the obliteration of stamps	Upon passing as fit for use for trade	In relation to the obliteration of stamps
1 ounce	⅗ grain	1⅕ grain	⅗ grain	1⅕ grains
8 ounces	3 grains	6 grains	3 grains	6 grains
1 pound	3 grains	6 grains	3 grains	6 grains
2 pounds	4½ grains	9 grains	6 grains	12 grains
4 pounds	9 grains	18 grains	12 grains	24 grains
7 pounds	12 grains	24 grains	18 grains	36 grains
10 pounds	18 grains	36 grains	27 grains	54 grains
14 pounds	24 grains	48 grains	36 grains	72 grains
28 pounds	45 grains	90 grains	66 grains	132 grains
56 pounds	75 grains	150 grains	120 grains	240 grains
112 pounds	4½ drams	9 drams	7½ drams	15 drams
224 pounds	7½ drams	15 drams	10½ drams	21 drams
Above 2 hundredweight	Add 1½ drams for each hundred-weight of capacity	Add 3 drams for each hundred-weight of capacity	Add 3 drams for each hundred-weight of capacity	Add 6 drams for each hundred-weight of capacity

3

Balances.

Capacity of instrument	Weight to be added to test sensitiveness when fully loaded		Error in excess or in deficiency when fully loaded
Upon passing as fit for use for trade	In relation to the obliteration of stamps	Upon passing as fit for use for trade	In relation to the obliteration of stamps
1 ounce	$\frac{1}{20}$ grain	$\frac{3}{20}$ grain	$\frac{1}{10}$ grain	⅕ grain
1 pound	$\frac{1}{10}$ grain	$\frac{3}{10}$ grain	⅕ grain	⅖ grain
7 pounds	½ grain	1½ grains	1 grain	2 grains
56 pounds	1½ grains	4½ grains	2 grains	4 grains

PART IIICOUNTER MACHINES

Capacity of machine	Weight to be added to test sensitiveness when fully loaded		Error in excess or in deficiency when fully loaded
Upon passing as fit for use for trade	In relation to the obliteration of stamps	Upon passing as fit for use for trade	In relation to the obliteration of stamps
1 pound	20 grains	60 grains	30 grains	60 grains
2 pounds	28 grains	84 grains	1½ drams	3 drams
4 pounds	40 grains	120 grains	2 drams	4 drams
7 pounds	2 drams	6 drams	3 drams	6 drams
10 pounds	2½ drams	7½ drams	3½ drams	7 drams
14 pounds	3 drams	9 drams	4½ drams	9 drams
28 pounds	4 drams	12 drams	6 drams	12 drams
56 pounds	6 drams	18 drams	9 drams	18 drams
1 hundredweight	8 drams	24 drams	16 drams	32 drams

PART IVSPRING BALANCES

Capacity of spring balance	Error in excess or in deficiency when fully loaded
Upon passing as fit for use for trade	In relation to the obliteration of stamps
1 pound	30 grains	60 grains
2 pounds	1½ drams	3 drams
3 pounds	1½ drams	3 drams
4 pounds	2 drams	4 drams
5 pounds	2½ drams	5 drams
6 pounds	2½ drams	5 drams
7 pounds	3 drams	6 drams
10 pounds	3½ drams	7 drams
11 pounds	3½ drams	7 drams
12 pounds	4 drams	8 drams
13 pounds	4 drams	8 drams
14 pounds	4½ drams	9 drams
15 pounds	4½ drams	9 drams
20 pounds	5 drams	10 drams
21 pounds	5 drams	10 drams
22 pounds	5 drams	10 drams
23 pounds	5½ drams	11 drams
24 pounds	5½ drams	11 drams
25 pounds	5½ drams	11 drams
26 pounds	5½ drams	11 drams
27 pounds	6 drams	12 drams
28 pounds	6 drams	12 drams
29 pounds	6 drams	12 drams
30 pounds	6 drams	12 drams
40 pounds and above	The weight corresponding to ¼ of the interval between consecutive graduations	The weight corresponding to ½of the interval between consecutive graduations

PART VSTEELYARDS

Weight to be added to test sensitiveness when fully loaded		Error in excess or in deficiency when fully loaded
Capacity of steelyard	Upon passing as fit for use for trade	In relation to the obliteration of stamps	Upon passing as fit for use for trade	In relation to the obliteration of stamps
56 pounds	12 drams	36 drams	18 drams	36 drams
1 hundredweight	1 ounce	3 ounces	2 ounces	4 ounces
3 hundredweight	2 ounces	6 ounces	4 ounces	8 ounces
5 hundredweight	3 ounces	9 ounces	6 ounces	12 ounces
7 hundredweight	4 ounces	12 ounces	8 ounces	16 ounces
10 hundredweight	6 ounces	18 ounces	12 ounces	24 ounces
20 hundredweight	10 ounces	30 ounces	20 ounces	40 ounces
30 hundredweights	13 ounces	39 ounces	26 ounces	52 ounces
40 hundredweights	16 ounces	48 ounces	32 ounces	64 ounces
50 hundredweights	20 ounces	60 ounces	40 ounces	80 ounces

PART VIDEAD-WEIGHT MACHINES

Vibrating weighing instruments				Accelerating weighing instruments
Capacity of machine	Weight to be added to test sensitiveness when fully loaded		Error in excess or in deficiency when fully loaded		Error in excess or in deficiency when fully loaded		Weight required to bring back the beam from position of greatest displacement when fully loaded
Upon passing as fit for the for trade	In relation to the obliteration of stamps	Upon passing as fit for use for trade	In relation to the obliteration of stamps	Upon passing as fit for use for trade	In relation to the obliteration of stamps	Upon passing as fit for use for trade
1 hundredweight	½ ounce	1½ ounces	1 ounce	2 ounces	1 ounce	2 ounces	2 ounces
3 hundredweight	1 ounce	3 ounces	2 ounces	4 ounces	2 ounces	4 ounces	4 ounces
5 hundredweight	1½ ounces	4½ ounces	3 ounces	6 ounces	3 ounces	6 ounces	6 ounces
7 hundredweight	2 ounces	6 ounces	4 ounces	8 ounces	4 ounces	8 ounces	8 ounces
10 hundredweight	3 ounces	9 ounces	6 ounces	12 ounces	6 ounces	12 ounces	12 ounces
20 hundredweight	5 ounces	15 ounces	10 ounces	20 ounces	10 ounces	20 ounces	20 ounces
30 hundredweight	6½ ounces	19½ ounces	13 ounces	26 ounces	13 ounces	26 ounces	26 ounces
40 hundredweight	8 ounces	24 ounces	16 ounces	32 ounces	16 ounces	32 ounces	32 ounces
50 hundredweight	10 ounces	30 ounces	20 ounces	40 ounces	20 ounces	40 ounces	40 ounces

PART VIIPLATFORM WEIGHING MACHINES

Vibrating weighing instruments				Accelerating weighing instruments			Machines with dials
Capacity of machine	Weight to be added to test sensitiveness when fully loaded		Error in excess or in deficiency when fully loaded		Error in excess or in deficiency when fully loaded		Weight required to bring back the steelyard indicator from position of greatest displacement when fully loaded must not exceed—	Error in excess or in deficiency when fully loaded
Upon passing as fit for use for trade	In relation to the obliteration of stamps	Upon passing as fit for use for trade	In relation to the obliteration of stamps	Upon passing as fit for use for trade	In relation to the obliteration of stamps	Upon passing as fit for use for trade	Upon passing as fit for use for trade	In relation to the obliteration of stamps
1 hundred-weight	½ ounce	1½ ounces	1 ounce	2 ounces	1 ounces	2 ounces	2 ounces	2 ounces	4 ounces
3 hundred-weight	1 ounces	3 ounces	2 ounces	4 ounces	2 ounces	4 ounces	4 ounces	4 ounces	8 ounces
5 hundred-weight	1½ ounces	4½ ounces	3 ounces	6 ounces	3 ounces	6 ounces	6 ounces	6 ounces	12 ounces
7 hundred-weight	2 ounces	6 ounces	4 ounces	8 ounces	4 ounces	8 ounces	8 ounces	8 ounces	16 ounces
10 hundred-weight	3 ounces	9 ounces	6 ounces	12 ounces	6 ounces	12 ounces	12 ounces	12 ounces	24 ounces
20 hundred-weight	5 ounces	15 ounces	10 ounces	20 ounces	10 ounces	20 ounces	20 ounces	20 ounces	40 ounces
30 hundred-weight	6½ ounces	19½ ounces	13 ounces	26 ounces	13 ounces	26 ounces	26 ounces	26 ounces	52 ounces
40 hundred-weight	8 ounces	24 ounces	16 ounces	32 ounces	16 ounces	32 ounces	32 ounces	32 ounces	64 ounces
50 hundred-weight	10 ounces	30 ounces	20 ounces	40 ounces	20 ounces	40 ounces	40 ounces	40 ounces	80 ounces

PART VIIISELF-INDICATING PIT-BANK WEIGHING MACHINES

Capacity of machine	Error in excess or in deficiency when fully loaded
Upon passing as fit for use for trade	In relation to the obliteration of stamps
1 hundred weight	6 ounces	12 ounces
2 hundred weight	9 ounces	1 pound 2 ounces
3 hundred weight	12 ounces	1 pound 8 ounces
4 hundred weight	15 ounces	1 pound 14 ounces
5 hundred weight	1 pound 2 ounces	2 pounds 4 ounces
7 hundred weight	1 pound 8 ounces	3 pounds 0 ounces
10 hundred weight	2 pounds 4 ounces	4 pounds 8 ounces
12 hundred weight	2 pounds 9 ounces	5 pounds 2 ounces
15 hundred weight	3 pounds 0 ounces	6 pounds 0 ounces
20 hundred weight	3 pounds 12 ounces	7 pounds 8 ounces
30 hundred weight	4 pounds 14 ounces	9 pounds 12 ounces
40 hundred weight	6 pounds 0 ounces	12 pounds 0 ounces
50 hundred weight	7 pounds 8 ounces	15 pounds 0 ounces

PART IXWEIGHBRIDGES

Vibrating weighing instruments without dials				Accelerating weighing instruments without dials			Instruments with dials
Capacity of machine	Weight to be added to test sensitiveness when fully loaded		Error in excess or in deficiency when fully loaded		Error in excess or in deficiency when fully loaded		Weight required to bring back the steelyard indicator from position of greatest displacement when fully loaded must not exceed—	Error in excess or in deficiency when fully loaded
Upon passing as fit for use for trade	In relation to the obliteration of stamps	Upon passing as fit for use for trade	In relation to the obliteration of stamps	Upon passing as fit for use for trade	In relation to the obliteration of stamps	Upon passing as fit for use for trade	Upon passing as fit for use for trade	In relation to the obliteration of stamps
1 ton	1½ pounds	4½ pounds	1½ pounds	3 pounds	1½ pounds	3 pounds	4 pounds	3 pounds	6 pounds
2 tons	2 pounds	6 pounds	2 pounds	4 pounds	2 pounds	4 pounds	5 pounds	4 pounds	8 pounds
5 tons	3½ pounds	10 ½ pounds	4 pounds	8 pounds	4 pounds	8 pounds	10 pounds	8 pounds	16 pounds
10 tons	5 pounds	15 pounds	6 pounds	12 pounds	6 pounds	12 pounds	15 pounds	12 pounds	24 pounds
20 tons	7 pounds	21 pounds	10 pounds	20 pounds	10 pounds	20 pounds	25 pounds	20 pounds	40 pounds
25 tons	8 pounds	24 pounds	12 pounds	24 pounds	12 pounds	24 pounds	30 pounds	24 pounds	48 pounds
30 tons	8½ pounds	25½ pounds	13½ pounds	27 pounds	13½ pounds	27 pounds	34 pounds	27 pounds	54 pounds
35 tons	9 pounds	27 pounds	15 pounds	30 pounds	15 pounds	30 pounds	37 pounds	30 pounds	60 pounds
40 tons	9½ pounds	28½ pounds	16 pounds	32 pounds	16 pounds	32 pounds	40 pounds	32 pounds	64 pounds
50 tons	10 pounds	30 pounds	18 pounds	36 pounds	18 pounds	36 pounds	45 pounds	36 pounds	52 pounds
75 tons	12 pounds	36 pounds	23 pounds	46 pounds	23 pounds	46 pounds	58 pounds	46 pounds	92 pounds
100 tons	14 pounds	42 pounds	28 pounds	56 pounds	28 pounds	56 pounds	70 pounds	56 pounds	112 pounds
200 tons	18 pounds	54 pounds	42 pounds	84 pounds	42 pounds	84 pounds	105 pounds	84 pounds	168 pounds

PART XCRANE WEIGHING MACHINES

Crane weighing machines constructed upon other than the hydraulic principle1

Machines with steelyard indicators				Machines with dials
Capacity of machine	Weight to be added to test sensitiveness when fully loaded		Error in excess or in deficiency when fully loaded		Error in excess or in deficiency when fully loaded
Upon passing as fit for use for trade	In relation to the obliteration of stamps	Upon passing as fit for use for trade	In relation to the obliteration of stamps	Upon passing as fit for use for trade	In relation to the obliteration of stamps
1 hundredweight	½ ounce	1½ ounces	1 ounces	2 ounces	2 ounces	4 ounces
5 hundredweight	1½ ounces	4½ ounces	3 ounces	6 ounces	6 ounces	12 ounces
10 hundredweight	3 ounces	9 ounces	6 ounces	12 ounces	12 ounces	1½ pounds
1 ton	1½ pounds	4½ pounds	1½ pounds	3 pounds	3 pounds	6 pounds
2 tons	2 pounds	6 pounds	2 pounds	4 pounds	4 pounds	8 pounds
5 tons	3½ pounds	10½ pounds	4 pounds	8 pounds	8 pounds	16 pounds
10 tons	5 pounds	15 pounds	6 pounds	12 pounds	12 pounds	24 pounds
20 tons	7 pounds	21 pounds	10 pounds	20 pounds	20 pounds	40 pounds
25 tons	8 pounds	24 pounds	12 pounds	24 pounds	24 pounds	48 pounds
30 tons	8½ pounds	25½ pounds	13½ pounds	27 pounds	27 pounds	54 pounds
35 tons	9 pounds	27 pounds	15 pounds	30 pounds	30 pounds	60 pounds
40 tons	9½ pounds	28½ pounds	16 pounds	32 pounds	32 pounds	64 pounds
50 tons	10 pounds	30 pounds	18 pounds	36 pounds	36 pounds	72 pounds
75 tons	12 pounds	36 pounds	23 pounds	46 pounds	46 pounds	92 pounds
100 tons	14 pounds	42 pounds	28 pounds	56 pounds	56 pounds	112 pounds
200 tons	18 pounds	54 pounds	42 pounds	84 pounds	84 pounds	168 pounds

Crane weighing machines constructed upon the hydraulic principle2

An amount equal to one-half of the weight represented by the interval between consecutive graduations.

PART XIAUTOMATIC WEIGHING MACHINES

Error in relation to the passing as fit for use for trade			Error in relation to the obliteration of stamps
For the purposes of Test A		For the purposes of Test A
Description of machine	Capacity of machine	When tested by means of test loads	When tested by means of the direct application of appropriate weights	For the purposes of Test B	When tested by means of test loads	When tested by means of the direct application of appropriate weights	For the purposes of Test B
Column 1	Column 2	Column 3	Column 4	Column 5	Column 6	Column 7	Column 8
All automatic weighing machines, other than those hereinafter described in columns 1 and 2 of this table	Under 10 pounds	½ per cent., in excess only, of the purported weight of each test load	Prescribed limit of error applicable to the type, class or description of the weighing instrument to which the machine most nearly relates	½ per cent., in excess only, of the purported weight of the test load	1 per cent., in excess only, of the purported of weight of the test load	Prescribed limit of error applicable to the type, class or description of the weighing instrument to which the machine most nearly relates	1 per cent., in excess only, of the purported of weight of the test load
10 pounds or more	½ per cent., in excess or in deficiency, of the purported weight of each test load	Prescribed limit of error applicable to the type, class or description of the weighing instrument to which the machine most nearly relates	Test not applicable	1 per cent., in excess or in deficiency, of the purported weight of each test load	Prescribed limit of error applicable to the type, class or description of weighing instrument to which the machine most nearly relates	Test not applicable
Automatic weighing machines for use only for use only for weighing grain	10 pounds or more	¼ per cent., in excess or deficiency, of the purported weight of each test load	Prescribed limit of error applicable to the type, class or description of the weighing instrument to which the machine most nearly relates	Test not applicable	½ per cent., in excess or deficiency, of the purported weight of each test load	Prescribed limit of error applicable to the type, class or description of weighing in strument to which the machine most nearly relates	Test not applicable
Automatic weighing machines for use only for weighing solid fuel	2 hundred-weight or less	2 per cent., in excess only, of the purported weight of each test load	Prescribed limit of error applicable to the type, class or description of the weighing instrument to which the machine most nearly relates	Test not applicable	2 per cent., in excess only, of the purported weight of each test load	Prescribed limit of error applicable to the type, class or the type, description of the weighing instrument to which the machine most nearly relates	Test not applicable
Automatic weighing machines for use only for weighing potato crisps	Any capacity	20 per cent., in excess only, of the total purported weight of 20 test loads	Prescribed limit of error applicable to the type, class or description of the weighing instrument to which the machine most nearly relates	Test not applicable	20 per cent., in excess only, of the total purported weight of 20 test loads	Prescribed limit of error applicable to the type, class or description of weighing instrument to which the machine most nearly relates	Test not applicable
Totalising weighing machines,	Any capacity	½ per cent., in excess or in deficiency, of the total purported weight of 40 test loads	Prescribed limit of error applicable to the type, class or description of the weighing instrument to which the machine most nearly relates	Test not applicable	1 per cent., in excess or in deficiency, of the total purported weight of 40 test loads	Prescribed limit of error applicable to the type, class or description of weighing instrument to which the machine most nearly relates	Test not applicable