(1)  Subject to subregulation (2) , an authorised officer may use a portable weighing device for the purpose of determining the wheel load, single axle load, axle group load or aggregate axle load of a heavy vehicle.

(2)  A portable weighing device is not to be used for the purpose of regulation 6 if –

(a) the load to be measured in any single weighing operation is less than one tonne or more than 9 tonnes; or

(b) the portable weighing device has not been –

(i) tested by the testing authority within the previous 6 months; and

(ii) shown to have a limit of error less than 2%; or

(c) any repairs to the mechanism have been carried out since the device was last tested and the device has not again been tested.

(3)  In this regulation –

testing authority means the Secretary of the responsible Department in relation to the Roads and Jetties Act 1935 or a person authorised by the Secretary to test portable weighing devices.