Regulation 10 of the Principal Regulations is amended as follows:(a) by omitting from subregulation (1)(b) "tester." and substituting "tester; and" ;(b) by inserting the following paragraph after paragraph (b) in subregulation (1) :(c) it is sealed in such a manner as to prevent interference with its speed-computing circuitry without breaking the seal.(c) by omitting subregulation (2) and substituting the following subregulation:(2) For subregulation (1)(b) , a device is not to be taken as having been repaired, altered or adjusted unless the repair, alteration or adjustment required the seal of the device to be broken.