22. Certificate of verification to be exhibited.- The person to whom a certificate of verification is issued shall exhibit the same in a conspicuous place in the premises where the weights, measures or weighing or measuring instruments, to which the certificate relates, are used: Provided that in the case of an itinerant vendor, the certificate shall be kept by him on his person: Provided further that in the case of a vehicle tank, the certificate of verification shall be kept with the vehicle. |