EGauge Model 4590 Soil Density Gauge

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This product is currently available for the US market only.

Troxler now offers a license-exempt option for soil quality control testing. The EGauge uses the proven nuclear technology for density measurements unlike other non-licensed density measurement devices. It provides accurate and reliable readings and it is easy to use. The EGauge Model 4590 complies with ASTM D8167.

Exempt from Licensing

Maintaining a radioactive materials license can be complicated and time consuming for owners of Specific Licensed gauges. In the United States, the EGauge is exempt from the radioactive materials license – no special training classes for operators, no TLD badges, no special shipping documents, and no reciprocity needed for use in other states.

Easy to Use

The operation of the Model 4590 is similar to that of the traditional Troxler nuclear density gauges so the experienced operator can use the gauge with little additional training.

Reliable and Repeatable Density Results

Data collected by multiple agencies shows excellent correlation between the EGauge and Troxler’s Model 3440 Density Gauge (R2values ranged from 0.93 to 0.98). EGauge repeatability is also equal to that of the current density gauges as listed in the applicable ASTM specification (0. 3 lb/ft3 (4.8 kg/m3)).

Complete with Moisture Probe

The Troxler Model 6760 Moisture Probe is provided with each EGauge. The electromagnetic probe measures the moisture of the soil in the same prepared hole that is used for the density measurement. Bluetooth technology enables the probe to communicate the moisture data to the EGauge allowing the gauge to display complete results. The EGauge also accepts moisture data using the keypad if another method is used.

Additional Features and Options

  • Easy to Read Display – easy to read enlarged LCD screen with backlighting for viewing in low light conditions
  • Automatic Depth Mode – detects the source rod depth during each measurement
  • Data Storage and Output – stores up to 1000 test readings under multiple projects for later recall or downloading
  • Auto-Store Function – automatically stores sample data under the active project when enabled
  • USB Port – access for outputting stored data to a printer or removable USB storage drive
  • GPS – records GPS information with each measurement and has Wide Area Augmentation System (WAAS) capabilities for better accuracy
“We absolutely love Troxler’s EGauge. It operates much like their nuclear density gauges, but no licensing is required, which we really like. Keep up the good work!”
William Mercurio, PE
Cherry, Weber & Associates
EGauge Studies and Reports
— The US Army Corps of Engineers Engineer Research and Development Center published the report “Validation Testing of Non-Nuclear Alternatives to Measuring Soil Density”. This report references the EGauge. Click here to download the report.
— Troxler presented a paper on the EGauge (“New Low-Activity Nuclear Gauge for Soil Wet Density Measurement with Low Regulatory Burden”) at the 2nd International Road Federation (IRF) Asia Regional Congress & Exhibition. Click here to download the paper.
The original 8” depth EGauges will be updated to 12” depth capable units when they are serviced, find out details here.”


Measurement Specifications
12 inch (15 mm) Depth
135 lb/ft3 (2163 kg/m3) Sample Density
Measurement Time = 2 min;
Background Time = 1 min
Repeatability (1-standard deviation) 0. 3 lb/ft3 (4.8 kg/m3)
Reproducibility (1-standard deviation) 0.5 lb/ft3 (8.0  kg/m3)[1]
Composition Error 0 lb/ft3 (0  kg/m3)
Mechanical Specifications
EGauge Size (HxLxW) 24.6” x 15.4” x 9.2”
625mm x 391mm x 234mm
Moisture Probe Size (HxLxW) 8.2” x 13.6” x 5.6”
208mm x 346mm x 142mm
Case Dimensions (HxLxW) 31.3” x 20.4” x 15.5”
795mm x 518mm x 393mm
Weight 35 lbs (13.8 kgb)
Shipping Weight 83.0 lbs (37.6 kg)
Operating Temperature 32º to 122º F  (0º to 50º C)
Storage Temperature 0º to 140º F  (-18º to +60º C)
Electrical Specifications  
Power Source  
Main NiMH rechargeable batteries
Backup 5 AA alkaline batteries
Charge Source 12 V dc, 2A
Battery Recharge Time 3 hours maximum
(may be charged incrementallywithout damaging the batteries)
Time Before Automatic Shutdown 5 hours of inactivity

* Reproducibility as measured is consistent with that stated in ASTM-D6938-10