The Director of the Food and Drug Division of the State Board of Health, his inspectors, or any duly authorized representative appointed by the State Comptroller for that purpose, or any highway patrolman, or sheriff, or deputy sheriff, or any other peace officer shall have, in the performance of his duties under this law, the power to inspect any premises or place where petroleum products are made, prepared, stored, transported, sold or offered for sale or exchange, take samples of same, and test measuring devices. It shall be unlawful for any person to hinder or obstruct or refuse to permit said inspectors or any other persons duly authorized to perform said duties in the exercise of such powers.