Rules and regulations for the carrying out and enforcement of the provisions of this subchapter, not inconsistent with the provisions thereof, shall be adopted by the department, which rules and regulations shall include reasonable variations or tolerances which may be allowed on weights and measures and weighing and measuring devices included within the provisions of this subchapter, and also specifications for such weights and measures and weighing and measuring devices for the guidance of manufacturers in the design and construction of such weights and measures and weighing and measuring devices.