EGauge Combo Model 4540 Asphalt & Soil Density Gau

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.

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License Exempt, Troxler Accurate

From the inventor of the nuclear density gauge comes the ONLY combination nuclear gauge that is License Exempt!

License Exempt

  • Less hassle and saves money.

  • Eliminates: RML, Reciprocity, TLD Badges, Storage Requirements, Transportation Documents, Double Locks, Leak Tests, Record Keeping, Emergency Procedures, Expensive Shipping, Radiation Safety Training, and Military Base Restrictions

  • Going with license Exempt equipment also eliminates the risk of a surprise inspection by the state regulatory agency or NRC.


Combination Design - Backscatter and Direct Transmittion

  • Asphalt using backscatter, compliant with ASTM D2950 and AASTHO T 355.

    • ASTM D2950: Standard Test Method for Density of Bituminous Concrete in Place by Nuclear Methods

    •  AASHTO T 355: In-Place Density of Asphalt Mixtures by Nuclear Methods

  • Soil using direct transmission and backscatter, compliant with ASTM D8167.

    • ASTM D8167: Standard Test Method for In-Place Bulk Density of Soil and Soil-Aggregate by a Low-Activity Nuclear Method (Shallow Depth)



  • Lab tested to hold similar accuracy as licensed nuclear gauges

  • Extremely accurate and more reliable than non-nuclear devices

  • Saves time due to not needing an offset/correlation


License Exempt nuclear density gauge, only available through Troxler.


Measurement Specifications

Reading Depths

Backscatter (~top 3.5” measured)
2-12” Direct Transmission

Reading Times

BS: 30sec, 1min, 2min, 3min, 4min
DT: 1min, 2min, 3min, 4min

ASTM Compliance

ASTM D2950 and D8167

Source Activity


Moisture Measurement

Bluetooth connected capacitance probe
Manual entrry

Mechanical Specifications

EGauge Size (H x L x W)

24.6” x 15.4” x 9.2”
625mm x 391mm x 234mm

Moisture Probe Size (H x L x W)

8.2” x 13.6” x 5.6”
208mm x 346mm x 142mm

Moisture Probe Size (H x L x W)

31.3” x 20.4” x 15.5”
795mm x 518mm x 393mm


33 lbs (14.97 kg)

Shipping Weight

83 lbs (38 kg)


Backlit 4x20 LCD

Electrical Specifications

Main Power Source

NiMH rechargeable batteries

Backup Power Source

5 AA alkaline batteries

Charge Source

12 V DC, 2A


Features: Auto Depth, LED Charger Indicator, GPS, Bluetooth, Remote Keypad, USB Port, Data Storage - 1,000 readings, Serial Port, and External Beeper.

Case Features: Extendable Handle and Wheels



EGauge Combo





Relative Density



Matches core and is industry standard

Correlations needed

Industry standard





Reading Times

30 seconds - 2 minutes

2-10 seconds


Best Use






Less accurate

Destructive and tested off sight



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