All taxicabs shall have affixed thereto a taximeter which shall conform to and comply with the specifications, tolerances and regulations of the Police Department, as determined by tests conducted by such Department. Errors in such taximeter shall not exceed plus or minus five percent to be considered acceptable. No person shall operate or permit the operation of any taxicab unless the meter has been inspected, tested and approved by the Police Department as conforming to the provisions of this chapter and unless the seal affixed by the Department is not broken. Taximeters shall be examined and tested at least once every six months by the Department and the Department shall keep a record of all such inspections, approvals and disapprovals. When a passenger is being transported, the flag shall be in such a position and the meter so set that it records mileage only, except when a taxicab is stopped and waiting.
Every taximeter shall be so affixed to the vehicle that the amount of fare determined by such meter shall be plainly visible to the passenger thereof. After sundown, the meters shall be illuminated by a suitable light.