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SIGMA is a US manufacturer that specializes in AV Flowmeters, Samplers, and Rain 
Gauge instrument. In 1997, Sigma became part of the Hach Company family.

MARSH-MCBIRNEY is a US manufacturer that specializes in Open Channel Flowmeters. For over 35 years, Marsh- McBirney has provided innovative and award winning open channel flowmeters designed for both portable (short-term) and permanent (long-term) flow monitoring applications. In 2006, Marsh- McBirney became part of the Hach Company family.




Area/Velocity Sensors

AV SENSOR

FLO-TOTE® 3


AV SENSOR



AV SENSOR with optional SURCHARGE VELOCITY SENSOR

FLO-DAR®


AV SENSOR with optional SURCHARGE VELOCITY SENSOR



AV Sensor

Sigma Submerged


AV Sensor



with Bubbler

Sigma Submerged - AV SENSOR


with Bubbler



Velocity Sensor

Sigma Low Profile


Velocity Sensor



 
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