Humboldt HS-5001EZ-2 Nuclear Gauge

Features of the EZ-2 Gauge


EZ-2 Gauge

Humboldt’s HS-5001EZ-2 reflects the latest in portable, electronic design for nuclear gauges, featuring a large, back-lit LCD display. Humboldt’s EZ-2 Moisture/Density Gauge is just that — easy. Easy-to-operate, easy-to-power and easy-to-service. The EZ-2 Gauge features a menu-driven control panel with easy-to-use, built-in test routines and auto features, making testing a quick and accurate operation. It also features our innovative trigger release handle that eliminates pinched fingers while providing smooth operation.

The EZ-2’s versatility allows it to measure density through direct transmission, backscatter, thin lift and trench modes, as well as providing moisture determinations. The gauge uses an advanced microprocessor-based technology to provide highly-accurate measurements of density and moisture that are automatically computed for direct readouts of wet density, dry density, moisture content, percent of moisture, percent of compaction (Proctor or Marshall), void ratio and air voids.

The EZ-2 Gauge complies with all pertinent standards: ASTM D6938, D2950, C1040 and AASHTO T310, T355 and is calibrated by the Five-block calibration method ASTM D7013 and ASTM D7759.

USB Icon

USB Port —

For fast, test download

Monitor Icon

Large Display —

Easily readable in bright sunlight LCD Type, TFT; Normal Black

Temperature Icon

Temperature Sensor —

Auto recording ambient temperature at test

Conversation Icon

Multi-Language —

Selectable: English, French, & Spanish

Gauge Icon

3D Accelerometer —

Auto turn off on motion (with movement of the gauge)

Card Icon

Micro SD Card —

Auto storage of 2GB of test Data, 250 tests per project

Battery Icon

Power Source —

6 AA batteries

GPS Icon


Geographic coordinates and altitude information

Clock Icon

Real Time Clock (RTC) —

Multi-date/time formats

Clock Icon

QR code-driven App

Capture and share data test results with anyone, anywhere




Operating Temperature: 14 to 158°F (-10 to 70°C) ambient, 347°F (175°C) Material Surface
Storage Temperature: -70 to 185°F (-55 to 85°C)
Humidity: 98% without condensation, Rain-Resistant Construction
Vibration: 0.1" (2.5mm) at 12.5 Hz
Shielding: Tungsten Powder Alloy
Source Rod: 440C Stainless steel, Induction, heat treated to 55 Rockwell C
Gauge Base: Computer-Machined 6061-T6 Aluminum, Hard-Coated and PTFE Impregnated
Post and Frame: Computer-Machined 6061-T6 Aluminum, Anodized for Anti-corrosion
Index Rod: 7075 aluminum, Hard Coated and PTFE Impregnated
Top Shell: Injection-Molded Noryl with Integral Color
Bearing: Relieved Bronze with Neoprene Seals
Screws/Fittings: Stainless Steel and Brass


Measurement: Density at 125 pcf (2000 kg/m3)

Direct Transmission, 6" (150mm) 15 seconds (Fast) 1 minute (Std.) 4 minutes (Slow)
Precision, pcf (kg/m3) ±0.5 (8) ±0.25 (4) ±0.13 (2)
Chemical Error, pcf (kg/m3) ±1.0 (16) ±1.0 (16) ±1.0 (16)
Surface Error, pcf (kg/m3) -0.5 (8) -0.5 (8) -0.5 (8)
Measurement Depth: 2 to 12" (50 to 300mm)
Backscatter, 3.5" (88mm) 15 seconds (Fast) 1 minute (Std.) 4 minutes (Slow)
Precision, pcf (kg/m3) ±1.0 (16) ±0.5 (8) ±0.25 (4)
Chemical Error, pcf (kg/m3) ±2.5 (40) ±2.5 (40) ±2.5 (40)
Surface Error, pcf (kg/m3) -3.0 (48) -3.0 (48) -3.0 (48)
Measurement Depth: 3.5" (88mm)
Moisture at 10pcf (160kg/m3) 15 seconds (Fast) 1 minute (Std.) 4 minutes (Slow)
Precision, pcf (kg/m3) ±0.5 (8) ±0.25 (4) ±0.13 (2)
Surface Error, pcf (kg/m3) -0.25 (4) -0.25 (4) -0.25 (4)
Measurement Depth: 4-8" (100 to 200mm)



Dimensions (base): 15.75" x 8.66" x 5.5" (400 x 220 x 140mm)
Handle Height: 18" or 21.5" (450 or 550mm)
Weight: 30 lbs (13.6kg)
Reference Standard:
Dimensions: 13.8" x 7.8" x 3" (350 x 200 x 75mm)
Weight: 10 lbs (4.5kg)
Transit Case:
Dimensions: 31" x 14" x 19.5" (787 x 356 x 495mm)
Weight: 31 lbs (11.8kg)
Accessory Case (loaded):
Dimensions: 19.7" x 9.8" x 5" (500 x 250 x 125mm)
Weight: 16 lbs (7.3kg)
Total Shipping Weight: 90 lbs (41kg)


Radioactive Materials Data Needed for License Application

Material Chemical/Physical Form Maximum Amount
Cesium-137 Sealed Source Humboldt 2200064 Not to exceed 11 millicuries per source
Americium-241:Be Sealed Source Humboldt 2200067 Not to exceed 44 millicuries per source



Display: TFT, Normal Black, Sunlight Readable
Display Dimension: 96.82(W) x 78.7(H) x 3(D) mm
Display Resolution: 640 x 480
Display Backlight: LED
Timer Stability: 0.01%
Language: Selectable – English, French, or Spanish
Power Supply Stability: 0.10%
Power Source: Six alkaline AA-size batteries
Power Consumption: 0.9 - 24mA, Battery Life—1200 hours
Power Protection: Main Batteries—Circuit Breaker Regulated Supplies—Short Circuit Proof
Low Battery Condition: LOBAT Alarm and Auto Shutoff for low and dead battery conditions
Battery Life: Remaining Battery Life Automatically Estimated at Power-up by activating TEST routine
Microcontroller (MCU): 160MHz, 32 Bit
Real Time Clock (RTC): Multi date/time formats
Shutdown: Auto / User Selectable
Temperature Sensor: Auto recording ambient temperature at test
3D Accelerometer: Auto turn off on motion
Micro SD Card: Auto storage of 2GB of test DaData - 250 tests per project



Gamma Source
Material, Type and Amount: Cs-137, 370MBq (10mCi)
Special Form Registration: USA/0356/S-96 Rev 12
ANSI and ISO Class: ANSI 77C66535
Neutron Source
Material, Type and Amount: Am-241: Be, 1.48GBq (40mCi)
Neutron Yield: 70 Knps ±10%
Special Form Registration: CZ/1009/S-96 Rev 1
ANSI and ISO Class: ANSI 77C66545
Type: Sealed Source, Special Form
Housing: Stainless Steel, Double Encapsulated
Surface Dose Rates 18.7 mrem/hr Maximum (Neutron and Gamma)
Transit (shipping) Case DOT 7A, Type A, Yellow II Label, O.2 TI