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美國Greyline
美國GREYLINE公司是一家致力于超聲波測量技術應用的公司，其產品有多普勒超聲波流量計、時差超聲波流量計、明渠超聲波流量計、超聲波液位計、超聲波液位差計。GREYLINE公司在美國和加拿大都設有工廠，銷售網絡遍布全球各地。
We develop and manufacture industrial flow and level monitoring instruments for measurement and control in water and wastewater treatment, industrial process automation and for environmental monitoring.
Greyline Level instruments include ultrasonic level transmitters, pump station controllers, tank farm monitoring systems, software and data loggers.

Greyline's ultrasonic Flow products include portable meters for troubleshooting and surveys, Doppler flow meters with strap-on sensors, flow switches, open channel and area-velocity flow monitors.