34. Except as specified in the EC type-approval certificate, a person shall not use an instrument for trade unless it is erected in such a manner that the operator can, notwithstanding the nature of the instrument or its surroundings, readily take up a single position from which he can—
(a)see directly or with the aid of mirrors, closed-circuit television or other permanently installed facilities, the whole of the unladen load receptor;
(b)operate the instrument’s controls; and
(c)obtain a weight reading from the instrument.