Paragraph 4
(1)
Where a cold water meter is marked with—
(a)
a temperature range, it must not be used for trade in temperatures outside that range; or
(b)
a flowrate range, it must not be used at a flowrate outside that range.
(2)
Where a cold-water meter bears a mark which signifies the manner and purposes of use, it must not be used for trade in a manner or for a purpose which does not accord with that marking.
(3)
A cold water meter must not be used for trade in circumstances—
(a)
in which it may be prevented from operating consistently or accurately; or
(b)
which are likely prematurely to degrade its metrological characteristics.
(4)
A cold-water meter must not be used for trade unless, when adjusted, the calibration of the instrument is set as close to zero as practicable.