4. In the case of a machine having an automatic zero tracking device or devices, these devices shall be effectively disabled during testing, by adopting a non-zero indication or printout as zero-for-the purposes of testing, so that the test results are not materially affected by the action of any of the automatic zero tracking devices.N.I.
Commencement Information
I1Sch. 2 para. 4 in operation at 13.2.2006, see reg. 1(1)