Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 98, § 10

The commonwealth shall also supply additional clinical standard thermometers necessary to carry out sections nine to fourteen, inclusive, to be known as office clinical standards. Such thermometers shall be verified by the deputy director upon their receipt and at least once in each six months thereafter, by direct comparison with the state clinical standard thermometer. The office clinical standards may be used in making comparisons of clinical thermometers under test.