The Director of Finance shall inspect or supervise the inspection of all deliveries of supplies, materials, equipment or contractual services to determine their conformance with the specifications set forth in or referred to in the order or contract. The Director of Finance shall have authority to require the submission of samples with bids where appropriate, to test such samples and to test deliveries for comparison with the sample submitted. In the performance of such tests, the Director of Finance shall have authority, within budgetary limitations, to make use of the laboratory facilities of any city, county or state agency, or any private laboratory.