Get to know us

Since 1958, Troxler has been the worldwide leader in precision quality control and measurement equipment for the highway and construction industries. We are dedicated to providing full service, training, and maintenance support for all our products through our international sales and support offices in the US, Canada, Germany and through our 50 distributors around the world.

All Troxler products are tested to guarantee quality, dependability, and performance, and are backed by the industry's leading warranties.

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What We Do

Troxler Electronic Laboratories, Inc. is a world leader in the manufacturing of testing/quality control measurement equipment for the construction industry. We are recognized worldwide as the industry standard for Nuclear Moisture/Density Gauges. In addition to nuclear gauges, Troxler is also a leader in the production of Gyratory Compactors and Asphalt Ignition Ovens. Troxler continues to set new product standards of quality and precision in the construction industry. For a complete list of Troxler equipment, please go to the Products section.

Troxler provides a full range of radiological services to support users of radioactive material and radiation producing devices in industrial, governmental, medical, and educational settings. These services include:

  • TLD badge service is offered to monitor external personnel radiation exposure.
  • Leak testing services are provided for sealed sources.
  • Gauge disposal service is provided for both Troxler and non-Troxler nuclear gauge products.
  • Calibration service is offered for the TroxlAlert™ radiation survey meter.
  • Emergency response phone service is provided free to all Troxler nuclear gauge customers to meet USDOT hazmat requirements.
  • Radiation safety training courses are designed to fulfill US NRC and Agreement State requirements for training nuclear gauge operators and Radiation Safety Officers. In addition, training is provided to fulfill US DOT hazardous material (hazmat) transportation training requirements. For more information about Troxler training courses and to view a current class schedule, please visit the Training page.
  • Free consultation is provided to Troxler customers on radioactive material licensing matters and radiation safety issues.

Troxler's Service Department provides full repair and calibration service for all Troxler products at several locations throughout the United States.

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Nuclear Moisture/Density Gauges

The Troxler Models 3430 and 3440 RoadReader™ nuclear moisture/density gauges measure the density and moisture of soil, aggregate, concrete and asphalt materials in the field for quality control purposes. These gauges offer two test modes: the direct transmission mode allows the source to be lowered below the surface in order to test a larger area of material and improve gauge precision. In backscatter mode, the source is positioned near the surface of the test material and the top four inches of material are penetrated by gamma rays. Moisture content of the material is also tested in a manner similar to the backscatter mode.

Model 3440The Model 3440 provides advanced software, an automatic depth indicator and many special functions and features in order to achieve the highest level of operator convenience.

The Troxler RoadReader Plus, Model 3450, offers the unprecedented combination of surface moisture and density measurements with thin layer density determination in a single nuclear gauge. In addition, the 3450 provides a host of technical improvements and innovations, ensuring easier operation, greater reliability, and improved performance. To the testing laboratory that works mostly on soils with only occasional asphalt work, the RoadReader Plus offers a significant opportunity for expanded measurements. For municipalities or counties verifying overlays, trench fills, and reworks, the 3450 is a workhorse that addresses the full range of operational requirements. And for the DOT or large operator with a full range of needs, the 3450 offers tremendous flexibility in a single, easy to use gauge.

The Troxler Thin Layer Density Gauge, Model 4640, features patented technology to measure the density of thin asphalt and concrete layers from 2.5 to 10 cm (1 to 4 inches) without influence from underlying material. This model and the Model 3450 are the only nuclear gauges on the market capable of this method of density testing. This gauge is a must-have for paving contractors and others who have the need to monitor asphalt compaction regularly.

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Gyratory Compactors

Model 5850Troxler Gyratory Compactors produce gyratory asphalt specimens that predict long-term pavement performance. Through their testing, the United States Strategic Highway Research Program (SHRP) developed a program for analyzing asphalt materials and designing hot mix asphalt known as Superpave™. The program is a system for specifying and testing component materials, designing asphalt mixtures, testing mixes, and predicting pavement performance.

The Troxler Gyratory Compactor is an integral part of the mix design and testing phases of Superpave. The Gyratory Compactor compacts the asphalt mixture with a fixed pressure while gyrating the mold at a fixed angle. The height of the specimen is continually monitored, providing information on the density of the mix throughout the compaction cycle. This information is recorded and can be saved or printed.

Troxler manufactures two models of Gyratory Compactors, the models 5850 and 4140.

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Asphalt Ignition Ovens

The quality of asphalt pavement is typically characterized by two very important factors: the asphalt binder content and the gradation of the aggregates. In the early 1990s the National Center for Asphalt Technology (NCAT) developed a method of separating the binder from the aggregates by igniting a sample of the mixture, which caused the binder to burn away, leaving only the aggregate.

Troxler Model 4730/4731 NTO is an ignition oven that uses infrared as the source of heating. This allows the mixture to ignite more quickly, and the chamber temperature to be greatly reduced compared to the first generation of ignition furnaces. Using infrared heaters also decreases the amount of electrical power required as compared to conventional ignition furnaces. The NTO may be powered by either a 120 VAC or a 208/240 VAC 15 Ampere supply.

In the ignition process, the mixture is heated until combustion of the binder is achieved. The NTO provides an advanced burn process that removes the binder more efficiently than conventional ignition furnaces or chemical methods. The loss in sample weight is directly related to the binder content. After the burn is complete, the aggregates are removed from the oven and allowed to cool for subsequent gradation analysis.


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