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.
Portable Volumetric Weirs