Ludlum Measurements, Inc. (LMI) has been designing, manufacturing and supplying radiation detection and measurement equipment in response to the worlds` need for greater safety since 1962. Throughout its 5-decade history, it has developed radiation detection technologies and instruments in support of enhancing the safety of personnel and the environment. It offers one of the largest lines of radiation detection instrumentation available from any one company.

Company details

501 Oak Street , Sweetwater , Texas 79556 USA

Locations Served

Our Distributors

Business Type:
Manufacturer
Industry Type:
Monitoring and Testing
Market Focus:
Globally (various continents)
Year Founded:
1962

This company also provides solutions for other industrial applications.
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Ludlum Measurements, Inc. (LMI) has been designing, manufacturing and supplying radiation detection and measurement equipment in response to the worlds' need for greater safety since 1962.  Throughout its 5 decade history, it has developed radiation detection technologies and instruments in support of enhancing the safety of personnel and the environment.  It offers one of the largest lines of radiation detection instrumentation available from any one company.

Longevity and Commitment
LMI’s earned reputation for affordability, high quality, reliability, durability, and long term support are well known and highly respected within each of the markets it currently serves. The core values established by its founder and president, Mr. Don Ludlum, continue in full force, without interruption or alteration by outside investors or buyers. Mr. Ludlum together with his son, Larry, remains at the helm of the company which has grown into a full scale enterprise operated by a staff of highly experienced professionals.

Totally Integrated
LMI has invested heavily into becoming a vertically integrated radiation detection company in order to better control costs, quality, and delivery times. Recent additions of in-house automated PC board assembly and plastic injection molding capability plus photomultiplier tube and plastic scintillation detector design and manufacturing all contribute to this succeeding philosophy.

Engineering Excellence
LMI has a significant investment in engineering to ensure it sustains a high level of competency and excellence within the organization. The width and breadth of the engineering organization affords it to rapidly develop many new designs each year while simultaneously supporting its large product line. Many of the time-tested and field-proven designs are credited to LMI’s engineering expertise in developing reliable instruments capable of withstanding rough handling and harsh environments.

Legendary Support
LMI is also legendary for its repair, calibration and training support. It is not uncommon to still be supporting instruments shipped several decades previously or well past what most traditional instrument companies would deem reasonable. LMI additionally supports calibration and repair on many radiation detection instruments it has not manufactured.

Dedication to Safety
Radiation detection is a vital part of ensuring safety not only in those endeavors which promote economic development, but also in better securing our homelands against possible terrorist activities. LMI has contributed significantly towards advancing security along borders and at sea ports. It has also equipped First Responders with tools that better enable them to respond to emergencies where unknown harmful materials may be present.

Listens to Customers
Ludlum is always interested in hearing about your needs and what will work best for you.  Doing what-ever it takes to keep our customers happy has been a long standing mandate dating back to the company founder, Mr.Don Ludlum.  Important decisions regarding fulfilling customer needs are not made in some distant board room by accountants and business managers who are unfamiliar with radiation detection or health physics; it's made by the same people you can talk to every day here at Ludlum.  Customers have contributed to many of the best ideas we've implemented.  While not every idea has been a commercial success, it has always made the customer happy, and that has translated into repeat business and a profitable operation.  So feel free to call us anytime and share with us your needs and ideas.


Don Ludlum's company has grown significantly since its humble beginning back in 1962. Today, the company has 7 divisions, employs over 500 people, and has US-based facilities in Texas and Tennessee, and another in Uxbridge of the UK. The product line has grown from its start with survey meters to a full line of radiation detection instrumentation, serves multiple key markets, and has sales representatives in over 85 countries throughout the world.

Ludlum now employs over 500 people overall, including its operations outside Sweetwater. The company also owns and operates seven divisions at this time. In addition to Ludlum Measurements Inc., the company now includes Eljen Technology, ADIT, ETEL, West Texas Molding, Ludlum Medical Physics, and Protean Instrument Corporation.

When asked what he thinks the company's most significant contribution to the radiation protection industry is, Don quickly says 'customer service.' 'We support products long after we produce them.' The company will continue to service a product that has been superseded by something else more than once. That's because Ludlum Measurements is a company that works hard to serve customers as individuals.

The fact that Ludlum's products have long lives is something Don is proud of, and he wants to allow customers to continue using a product as long as it matches their requirements. However, Don says that Ludlum Measurements' greatest success - customer service - is what will be its greatest challenge to sustain in the future.

Times haven't always been great for Ludlum. Don considered selling the company in the early 1970s when he faced some difficult times. Don has received many offers for his company over the years. However, he didn't want to see Ludlum Measurements become another corporate giant that forgot about customer service. 'In order to help the customer, you have to stay small,' he says.

It's not just the amount of profit a company earns that makes it exceptional, but how the business impacts its community overall.