Regulation 17 Prescribed limits of error
The prescribed limits of error relating to any measuring equipment shall be those set out in Table 1 in the Schedule to these Regulations:
Provided that—
except in the case of equipment constructed to deliver a fixed quantity only, for a quantity equivalent to the minimum delivery of the equipment the prescribed limits of error shall be those set out in Table 2 in the Schedule to these Regulations;
where a quantity indicated by the measuring equipment is larger than the minimum delivery of the equipment, then the prescribed limit of error for the said quantity shall never be less than that prescribed for the quantity equivalent to the minimum delivery of the equipment set out in the said Table 2;
if, on testing with a view to passing as fit for use for trade, the errors on all the quantities of individual grades of liquid fuel indicated by the measuring equipment during the tests are all errors in excess or all errors in deficiency then, notwithstanding that they are all within the prescribed limits of error set out in the said Table 1 or 2 as appropriate, at least one of them shall not exceed either—
one-half of the prescribed limits of error set out in the said Table 1 or 2 as appropriate; or
0.3% of the quantity indicated;
whichever is the greater;
in relation to the retesting of any equipment fitted with a price computing device which—
is, in the opinion of an inspector, only required to be retested as a result of an adjustment of that device occasioned by a change in price; and
has previously been tested and passed as fit for use for trade (but not since the said adjustment was made),
the prescribed limits of error shall be the amounts set out in the said Table 1 or 2 as appropriate in relation to obliteration of the stamp; and
in relation to the retesting of any equipment converted to indicate the quantity delivered in metric units which—
is, in the opinion of an inspector, only required to be retested as a result of such conversion; and
has previously been tested and passed as fit for use for trade (but not since the said conversion was made),
the prescribed limits of error shall be the amounts set out in the said Table 1 or 2 as appropriate in relation to obliteration of the stamp.
On the testing of any measuring equipment fitted with a price computing device the difference between the price indicated by that device and the price computed on the basis of the unit price and of the quantity indicated for test purposes shall not exceed the price of the quantity equal to the error in deficiency set out in the said Table 2 for a quantity equivalent to the minimum delivery of the equipment in relation to obliteration of the stamp.