It shall be the duty of every public weighmaster registered under this chapter to issue a certificate of weight, measure, count, recording or readings on forms approved by the Commissioner of Agriculture to enforce the provisions of this chapter together with rules and regulations relating thereto. All public weighmasters shall keep and preserve, as records, for a period of one year from date of issuance unless otherwise specified in regulations authorized by the Commissioner of Agriculture, copies of all certificates issued upon public weighings, measurings, or counts. These records shall at all times be open for inspection by the Commissioner of Agriculture or by his authorized representatives.