… supply or production meters, including calibrating meters therefor. …
Explanatory notes
… fall in this heading whether or not fitted with a clockwork recording device, or with a simple mechanical or electrical … (turbine, piston, diaphragm, etc.), the mechanism for regulating the admission of fluid (generally slide valves), … (endless screw, camshaft, gears or other systems), and a recorder or an indicator (pointer or drum type) or both. …