In the case of single-axle trailers and trailers with close-coupled axles where the axle spread is less than 1 metre, these control devices shall be equipped with a mechanism indicating its horizontal position (e.g. spirit level) and shall be manually adjustable to allow the mechanism to be set in the horizontal plane in line with the direction of travel of the vehicle.

(f) Pumps incorporating measuring devices, of heading No 84.13 ; weight-operated counting and checking machinery, or separately presented weights for balances (heading No 84.23) ; lifting or handling machinery (heading Nos 84.25 to 84.28) ; paper or paperboard cutting machines of all kinds (heading No 84.41) ; fittings for adjusting work or tools on machine-tools, of heading No 84.66, including fittings with optical devices for reading the scale (for example, "optical" dividing heads) but not those which are in themselves essentially optical instruments (for example, alignment telescopes) ; calculating machines (heading No 84.70) ; ...[+++] valves and other appliances (heading No 84.81);