Surveying, optical, measuring and regulating apparatus and instruments, namely, flowmeters and flow velocity measuring devices for liquids, gases and multi-phase products; gas testing instruments; speed indicators; high-frequency apparatus, namely, sound velocity measuring devices for liquids, gases and multi-phase products; quantity indicators, namely, liquid level meters and control devices, concentration and density measuring devices, water-in-oil and oil-in-water monitors, sand and solid ...

Measuring and analysis instruments