Aerometers; Air analysis apparatus; Altimeters; Analysis instruments for photogrammetric purposes; Anemometers; Densimeters; Distance measuring apparatus; Ergometers not for medical purposes; Force measurement products, namely, digital force gauges, digital torque gauges and manual and motorized test stands used therewith sold as a unit with the gauges; Frequency meters; Hygrometers; Manometers; Oscillographs; Range finders for cameras; Slide calipers; Surveying instruments; Technical measuri...