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. Compatibility 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.


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