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Measuring instruments and apparatus for use in measuring and recording certain characteristics or events that occur in oil and gas wells, namely, open hole wireline acoustic logging tools used to gather data that measures radporosity, amplitude variation, rock properties and borehole stress data, anisotrophy, through casing data, and fracture detection; electronic sensors for measuring radioactivity levels in oil and gas wells; and fiber optic monitoring systems comprised of gauges, sensors, and meters that gather, monitor, and transmit pressure and temperature data in oil and gas well testing and drilling operations; flow meters, sensors and transmitters for measuring the mass flow rate of fluids, gases and vapors in oil and gas wells; and telemetry sensors for simultaneous real time transmission of data via digital telemetry cartridge and output through a surface interface panel