9 Scientific, surveying, measuring, signalling, checking and monitoring apparatus and instruments for use in the oil and gas industry, namely, sensors for measuring pressure and pressure gauges; computer software for use in mapping hydraulic fractures and in determining a geometric parameter of fractures created in the subsurface for the oil and gas industry; apparatus and instruments for collecting, recording, transmission, processing, reproduction, storage, editing, analyzing and sharing of data, namely, computer hardware; apparatus and instruments for use in monitoring, measuring, testing, controlling, sensing, recording and indicating pressure, namely, pressure sensors; simulation apparatus, namely, reservoir simulators; pressure indicator plugs for valves; parts, fixtures and fittings for computer hardware, pressure sensors, and pressure gauges