For the purposes of section 88 of the Act, a prescribed measuring device is tested in the prescribed manner if the testing officer who tests the device—
(a) is satisfied that the device is in a satisfactory electrical condition and, in particular, that any maintenance carried out on the device has been carried out in a satisfactory manner; and
(b) is satisfied that the device is properly calibrated so that it operates within the limits of error of not more than 2 knots greater than or less than the true speeds determinable from the test; and
(c) records and retains the results of the test, including—
(i) a statement showing the frequencies or speeds at which the calibration was effected and the number of times at each frequency or speed the calibration was effected; and
(ii) the date of the test and the ambient temperature at the time of the test.