WEIGHTS AND MEASURES PART I GENERAL Citation, commencement and revocation 1 1 These Regulations may be cited as the Weights Regulations 1986 and, except Regulations 1(4) and 13, shall come into operation on 1st November 1986. 2 Regulations 1(4) and 13 shall come into operation on 1st September 1988. 3 The Regulations specified in Schedule 5 to these Regulations, with the exception of Regulation 12 of the Weights Regulations 1970 , are hereby revoked: Provided that Part II of, and Schedule 3 to, the Weights Regulations 1970 shall continue to have effect until 1st September 1988 in so far as they are necessary for the purposes of Regulation 12 of those Regulations. 4 Regulation 12 of the Weights Regulations 1970 shall be revoked on 1st September 1988. Interpretation 2 1 In these Regulations— “ analogue ” means capable of assigning any value or position within a continuous range; “ appropriate local or working standard weights ” means the local standards or working standards of weights specified in column 2 of the Table in Schedule 3 to these Regulations in the case of the weights specified in column 1; “ digital ” means capable of assigning only certain discrete values or positions within a continuous range by a series of discontinuous steps; “ discrimination threshold ” means , in the case of testing equipment with a digital indicator, the weight which produces a change of reading of one digit, and in the case of testing equipment with an analogue indicator, the weight which produces a 1 mm apparent movement of the pointer; “ prescribed limits of error ” relating to weights has the meaning set out in Regulation 10 below; “ repeatability ” means the ability of weighing equipment to indicate, under defined conditions of use, closely similar quantities on repeated weighings; and “ the stamp ” means the prescribed stamp and “ stamped ” and “ stamping ” shall be construed accordingly. 2 The symbols for, and abbreviations of, units of weight and of measurement used in these Regulations refer to the relevant units as set out in Schedule 1 to these Regulations. Application 3 1 Subject to paragraph (2) below, these Regulations shall apply to all weighing or measuring equipment for use for trade of the following class namely weights, and such weights are hereby prescribed for the purposes of section 11(1) of the Act. 2 Nothing in these Regulations shall apply to— a weights for use only for weighing coins or currency notes for the purpose of determining their number; b proportional weights or proportional counterpoises used through a system of levers on graduated non-self-indicating weighing machines; or c externally-controlled weights used through a system of levers and incorporated in two- or three-knife edge balances. PART II MATERIALS AND PRINCIPLES OF CONSTRUCTION AND MARKING OF WEIGHTS Materials 4 Except to the extent that it may— a contain lead in an adjusting hole, or b be painted, coated or otherwise treated to inhibit corrosion, a weight, other than a weight for use in connection with the manufacture of explosives, shall— i if of the flat or wire type, be made of gold or platinum or aluminium or of an alloy of any of those metals or of a metal of a density of not less than 7000 nor more than 9500 kg /m>3>; or ii if of any other type, be made of a metal of such a density as aforesaid and of hardness at least equal to cast brass. Shape 5 1 Except as provided by paragraph (2) of this Regulation, a weight shall only be of a type or form mentioned in the following Table in relation to a weight of its purported mass:— Type or form Weights which may be of that type or form 1. Metric weights (other than carat (metric) weights) (i) The irregular octahedronal form described in Schedule 2 to these Regulations. Weights of 25 kg. (ii) The rectangular form described in that Schedule. Weights of 5 kg, 10 kg or 20 kg. (iii) The cylindrical form described in that Schedule. Weights of not more than 10 kg nor less than 20 g and of 10, 5, 2 and 1 g. (iv) The hexagonal form described in that Schedule. Weights of not more than 2 kg nor less than 100 g. (v) The disc form described in that Schedule. Weights of not more than 50 g nor less than 1 g. (vi) Flat type. Weights of not more than 1 g nor less than 10 mg. (vii) Wire type. Weights of 50 mg or less. 2. Carat (metric) weights (i) Cylindrical with a knob. Weights of 5 C.M. or more. (ii) Flat type. Weights of not more than 20 C.M. nor less than 0.05 C.M. (iii) Wire type. Weights of 0.25 C.M. or less. 3. Imperial weights (other than weights in paragraphs 4 and 5 of this Table) (i) Bell, bar, flat-circular or ring type. Any weight other than a weight of 50, 20, 10 or 5 lb. (ii) Octagonal type. Weights of 50, 20, 10 or 5 lb. 4. Weights expressed as multiples or fractions of 1/7000 lb Flat or wire type. All such weights. 5. Ounce troy weights (i) Cylindrical with a carrying handle or knob. Weights of 1 oz tr or more. (ii) Flat or wire type. Weights of 0.5 oz tr or less. 2 Nothing in paragraph (1) of this Regulation or Schedule 2 to these Regulations shall preclude any weight from being regarded as fit for use for trade by reason of the fact that one or more edges are chamfered or rounded. Adjusting holes 6 1 No metric weight of less than 20 g and no imperial weight of less than 1 oz shall have an adjusting hole. 2 No other weight shall have more than one adjusting hole. 3 An adjusting hole shall be in the form of a cavity in a plane surface of the weight, and shall be a empty; b undercut and plugged with lead; or c closed by a plug or disc made of brass or steel. 4 Where an adjusting hole is closed with a plug or disc, the plug or disc shall, except in the case of a carat (metric) weight or an ounce troy weight, be secured by a lead pellet driven into an undercut recess or, if the cavity is threaded, into the thread so that it is not readily removable. 5 No plug, disc or lead shall protrude from the surface of the weight. Marking 7 1 All weights other than wire weights shall be marked with a durable and legible indication of their purported mass. 2 The marking shall comprise figures indicating the number of units and words or an appropriate symbol or abbreviation mentioned in Schedule 1 to these Regulations to indicate the relevant unit. 3 No weight shall bear any marking other than:— a the markings hereinbefore mentioned; b the name or mark of the maker; c the name of the owner or an indication of his name; d the stamp applied by an inspector of weights and measures; or e in the case of a weight first passed as fit for use for trade and stamped before 27th April 1978, the word “dram” or the abbreviation “dr”. 4 Where a weight bears the name or mark of its maker or the name of its owner or an indication of the owner's name, the height of the mark or lettering shall not exceed one-half of the height of the figures employed to indicate its purported mass. PART III TESTING 8 Every weight submitted for testing or tested shall be in a clean condition. 9 1 An inspector shall test weights with a view to passing as fit for use for trade and, where appropriate, stamping against appropriate local or working standard weights by the method of substitution on testing equipment which has been tested in accordance with the relevant provisions of the Weights and Measures (Local and Working Standard Weights and Testing Equipment) Regulations 1986: Provided that the repeatability and discrimination threshold of the testing equipment used shall not exceed one-fifth of the relevant amount specified in column 2 of the relevant Table in Schedule 4 to these Regulations as the prescribed limit of error on passing as fit for use for trade for the weight which is being tested. 2 An inspector shall test weights with a view to the obliteration of the stamp, where appropriate, against appropriate local or working standard weights by the method of substitution or, if he considers it sufficient, by comparison, on testing equipment referred to in paragraph (1) above: Provided that the repeatability and discrimination threshold of the testing equipment used shall not exceed one-half of the relevant amount specified in column 3 of the relevant Table in Schedule 4 to these Regulations as the prescribed limit of error in relation to the obliteration of the stamp for the weight which is being tested. PART IV SUPPLEMENTARY PROVISIONS Prescribed limits of error 10 The prescribed limits of error relating to weights shall be those set out in the relevant Table in Schedule 4 to these Regulations. Passing as fit for use for trade 11 A weight shall not be passed as fit for use for trade unless— a it complies with all the appropriate requirements of these Regulations; and b on testing it falls within the prescribed limits of error in relation to passing as fit for use for trade in column 2 of the relevant Table in Schedule 4 to these Regulations. Stamping 12 Weights shall be stamped— a on the lead in the adjusting hole, or b on the bottom of the adjusting hole if it contains no lead, or c on the bottom of the weight if there is no adjusting hole, or d on the lead pellet securing any plug or disc. Obliteration of stamps 13 1 Where a weight bearing the stamp is found by an inspector to be heavier or lighter than its purported mass by more than the prescribed limit of error set out in column 3 of the relevant Table in Schedule 4 to these Regulations he shall either obliterate the stamp or serve upon the person in possession of the weight a notice requiring him to have it adjusted within 28 days. 2 Where a notice is served as aforesaid and the weight is consequently retested after the expiration of that period and found to be outside the said prescribed limit of error, the inspector shall obliterate the stamp on it. 3 Where a weight bearing the stamp is found by an inspector not to comply with any other appropriate requirement of Part II of these Regulations, he shall obliterate the stamp on it. 4 The stamp shall be obliterated by an inspector, in accordance with the requirements of this Regulation, by impressing on it a design in the form of a six-pointed star as shown in the following illustration: Michael Howard Parliamentary Under-Secretary of State Department of Trade and Industry 29th September 1986