electrical components, instrumentation, and controls, namely, [ coils and switches; flow, level, start-up timing, transfer and reroute controls, ] control panels, monitors; automated, local, and remote control units and stations, and transmitters therefor; [ modular circuits; and ] other units utilizing electric circuitry, namely, oil field production units; measuring and metering units, namely, [ metering units, flow meters, ] [ chambers, ] treaters, and separators; [ well testing units; ] [ digital integrators; analog to digital converters; ] [ pulse totalizers; ] alarm monitoring and telemetering units; [ test programming and recording units; ] [ capacitance probes for measurement of fluid interfaces and contamination; ] electrical [, mechanical, and pneumatic ] controls, comprising time [ cycle, pressure, liquid level, specific gravity, temperature, switching, ] monitoring [, transfer, start up and timing controls and parts therefor; mountings and attachments therefor, packaged as a unit; ] [ oil and gas well test units; hydrometer; control panels, and nucleonic measuring instruments for measuring pipe thickness, pipe density, and liquid levels ]