Model 3242 Asphalt Content Gauge

About Troxler Products

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 review this Products section.

Troxler's Model 3242 Microlab Asphalt Content System provides a quick, accurate, and safe method of measuring the asphalt content of your bituminous mixes in your lab.

In most countries you can possess the Model 3242 without the expense of obtaining a Radioactive Materials License. In states governed by the US Nuclear Regulatory Commission, the savings in licensing fees can pay for the Microlab after just a few months of lab operation. In states or countries with their own license requirements, your savings may be even higher.


Precision @ 6% Asphalt
1 min.
4 min.
8 min.
16 min.
7000 gram
4" compacted
6" compacted
Neutron Source

100 µCi ±10% Cf-252

Source Form Stainless Steel Encapsulation, Special Form
Shielding Polyethylene and Cadmium
Shipping Case DOT 7A, Type A
Power Source 110/220 VAC, 50/60 Hz; 12 V vehicle battery or 
Alkaline Batteries (D Cell)
Power Consumption

1 Watt (nominal)

Baud Rate Range 300 - 2400 baud
Test Data Storage Up to 99 tests
Calibration Storage Up to 64 calibrations
Interface RS-242C for transfer to printer or computer
Length 14.25 in. (36.2 cm)
Width 11.00 in. (27.9 cm)
Height 10.50 in. (26.7 cm)
Weight 30 lbs. (13.62 kg)
Operational Temperature 0 to 140°F (-18 to 60°C)
Sample Temperature 0 to 350°F (-18 to 177°C)
Mechanical (Control Unit)
Length 8.62 in (21.9 cm)
Width 11.00 in. (27.9 cm)
Height 3.60 in. (9.2 cm)
Weight 2.75 lbs. (1.25 kg)
Operational Temperature 0 to 140°F (-18 to 60°C)
Sample Temperature 0 to 350°F (-18 to 177°C)

Supplied with:

  • Four stainless steel pans.
  • One 4" fixture with Universal Sample System (6" available as an option).
  • Four Helium3 thermal neutron detectors.
  • Hardshell case for transport.


The Model 3242 Microlab System eliminates many of the licensing requirements of the Model 3241-C, but it doesn't sacrifice any of the performance features. The Model 3242 gives you:

  • Nuclear asphalt content measurement without the need for a Radioactive Materials License (in most cases) 
  • Asphalt content measurement without the hazard and expense of the toxic chemicals employed in the solvent extraction method 
  • Compatible with the optional Universal Sample System, providing the added convenience of measuring either the commonly used 100 mm (4 inch) or 150 mm (6 inch) laboratory compacted samples 
  • The ability to download test data directly to a printer or computer, simplifying the reporting of results 
  • Calibration transfer from a centrally located gauge greatly reduces calibration time for field sites.
  • A twelve-month warranty and fifty years of Troxler experience give you the confidence you deserve.
Product Resources
3242 Product Brochure


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