Measurement apparatus and equipment including those for scientific, nautical, topographic, meteorologic, industrial and laboratory purposes, thermometers, not for medical purposes barometers, ammeters, voltmeters, hygrometers, testing apparatus not for medical purposes, telescopes, periscopes, directional compasses, speed indicators, laboratory apparatus microscopes, magnifying glasses, stills, binoculars, ovens and furnaces for laboratory experiments apparatus for recording, transmission or ...