Air analysis apparatus; Alidades; Altimeters; Analysis instruments for photogrammetric purposes; Apertometers; Densitometers not for medical use; Distance measuring apparatus; Galvanometers; High-frequency switching power supplies; Hydrometers; Lasers, not for medical purposes; Levelling rods; Measuring apparatus, namely, laser distance meters; Micrometer screws; Observation rockets; Optical inspection apparatus; Photometers; Precision theodolites; Refractometers; Spectrograph apparatus; Surv...