Clinometers; Hygrometers; Tachometers; Telemeters; Air analysis apparatus; Depth gauges; Digital multimeters; Electronic apparatus, namely, motion detectors; Frequency meters; Gas testing instruments; Geiger counters; Instruments and apparatus for controlling electric current, namely, electrical controllers for magnetic bearing control; Instruments for detecting and measuring two-dimensional distribution of force and pressure; Photometers; Radiation detectors; Refractometers; Surveyors' level...