[ Air analysis apparatus; ] Altimeters; [ Amplifiers; ] Anemometers; [ Bar code readers; ] Capacitors; [ Converters, electric; ] Depth gauges; [ Electronic card readers; Flow meters; Gas testing instruments; Geiger counters; ] Hygrometers; [ Level measuring machines; Levelling rods; Light emitting diodes (LEDs); ] Loudspeakers; Metal detectors; Micrometers; Microscopes; [ Money counting and sorting machines; Oscillographs; Petri dishes; pH meters; Planimeters; Polarimeters; ] Protractors; [ R...