9 High-frequency apparatus for fluid contamination control and measurement, namely, particle counters and particle analyzers for measuring particulate contamination, moisture and temperature levels of fluids; electrical and electronic control apparatus and instruments for fluid contamination control and measurement, namely, particle counters and particle analyzers for measuring particulate contamination, moisture and temperature levels of fluids; laboratory apparatus and instruments for fluid contamination control and measurement, namely, glass bottles for laboratory use, glass bottle samplers for laboratory use, particle counters and particle analyzers for measuring particulate contamination; laboratory filters; data communication apparatus and instruments for fluid contamination control and measurement, namely, electronic monitors for measuring particulate contamination, moisture and temperature levels in fluids; scientific, optical, measuring, signaling and checking apparatus and instruments namely, devices for measuring physical characteristics of fluids in hydraulic or pneumatic systems in the nature of particle counters and particle analyzers for measuring particulate contamination, moisture and temperature levels of fluids in hydraulic or pneumatic systems; apparatus for monitoring and recording the performance of hydraulic systems, namely, electronic monitors for measuring particulate contamination, moisture and temperature levels of fluids; precision measuring apparatus for fluid contamination control, namely, particle counters and particle analyzers; electrical control, measuring, testing and monitoring apparatus for fluid contamination control, namely, electronic particle counters, particle analyzers and monitors for measuring particulate contamination, moisture and temperature levels of fluids; fuel gauges; contacts, electric; optical frequency metrology devices; level indicators; pressure indicators; measuring and testing machines and instruments, namely, pressure test connectors for testing pressure of fluids in hydraulic or pneumatic systems; measuring apparatus, namely, measuring rulers; pressure measuring apparatus; luminous flux meters; sensors being measurement apparatus, other than for medical use, namely, solid contamination sensors; level sensors, namely, sensors for measuring fluid levels, not for medical use; liquid level sensors; oil level sensors; pressure sensors; industrial process control software; pressure indicator plugs for valves; electronic display units, namely, electronic LCD display unit with multi-networking (TCP/IP) capabilities; visual display units, namely, Flat Panel Display Screens; downloadable computer software for remote monitoring and analysis of machinery performance; water filter controllers