Affordable :: accurate :: portable


Thel-mar is a manufacturer of the compound Volumetric Weir.  A family run business for over 35 years, Thel-mar is woman owned and operated.  Located in beautiful Brevard, NC, all of our products are made in the USA and distributed both stateside and internationally.   

The Thel-mar Volumetric Weir offers the most accurate and affordable portable flow-measuring devices in the industry. Click
here for more information on our products.


Thel-Mar, LLC

Portable Volumetric Weirs

Thel-mar Portable Volumetric Weirs

Our Weirs in Action

Articles about Thel-mar