Thel-mar is a manufacturer of the Portable Compound Volumetric Weir. A family run business for over 40 years. Thel-mar is woman owned and operated. Located in Dickson Tennessee, all of our products are made in the USA. Thel-mar distributes their weirs both stateside and internationally.
The Thel-mar Volumetric Weir offers the most accurate and affordable portable flow-measuring devices in the industry. New and improved, the Thel-mar faceplate is now laser engraved and cut. Click for more information.