- Global WaterFlow Probe
- Global Water Microflow Meter
- GPI Digital Flow Meters
- Greyline Open Channel Flow Monitor 4.0
- Greyline PDFM-IV Doppler Flow Meter
- Greyline Portable Ultrasonic Flow Meter PT500
- Greyline Portaflow Transit Time Flow Meter
- Greyline Stingray Level-Velocity Logger
- Marsh McBirney Flo-Mate 2000

