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geophysical surveying precision instruments and equipment for use exclusively in prospecting for, or in the exploration and development of, petroleum, natural gas, water wells and minerals, or for geophysical studies for engineering projects, including the following: magnetometers; gravity meters and other instruments designed to measure the elements, variations and distortions of the natural gravitational force; field potentiometers, meggers, non-polarizing electrodes, and electrical equipment for making measurements in drill holes; instruments and equipment for seismic prospecting; geiger muller counters and other instruments for radioactive methods of geophysical prospecting; electrical and electronic amplifying devices and electrical thermostats designed to be used with any of the foregoing; repair parts, tripods and fitted carrying cases for any of the foregoing, and