• Nuclear Density Gauge

Nuclear Density Gauge

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Humboldt's HS-5001SD Moisture/Density Gauge provides easier and more efficient operation, data collection and processing, safety and repair than any other gauge in its class.

This new Gauge uses state-of-the-art technology to bring you a host of new features to make your job easier. Featuring a 4.3" touch-screen, the SD Gauge provides intuitive operation of all gauge operations. You also have the option to use the gauge's touch pad instead of the touch-screen, if desired.

The SD’s versatility allows it to measure density through direct transmission and backscatter modes, as well as including thin lift and trench modes, as well as moisture determinations. The gauge uses an advanced micro-processor-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 SD Gauge complies with all pertinent standards: ASTM D6938, D2950, C1040 and AASHTO T310.

The gauge is calibrated by the Five-block calibration method.


  • Touch-Screen or Touch Pad
    You have your choice with the new Humboldt HS-5001SD Moisture/Density Gauge. The gauge features a 4.3" touch-screen, which provides complete control or you can also use the menu-driven touch pad.
  • Easy to Power
    The SD Touchscreen Gauge is powered by a rechargeable Li-ION battery, which provides up to 60 hrs. of runtime. In addition, the gauge can also be powered by six standard AA alkaline batteries. Car charger available.
  • GPS
    The SD Gauge is equipped with GPS, which keeps track of the actual location of your readings to ensure locations and validity of tests.
  • Bluetooth Enabled
    The new SD gauge can connect to your PC for downloading test results via its Bluetooth wireless technology. No more cables and gauges on your desk. Bluetooth provides a reliable and secure connection up to 30 feet.
  • USB Port
    The SD gauge also has a USB slot, which provides a convenient way to capture test data and take it with you, as well as provide an easy way to upgrade the gauge's firmware. Firmware upgrades will be available via the internet from our website.
  • Easy Self Repairs
    The SD Gauge's modular design enables it to be serviced in the field by you, if necessary. No need to send the gauge in for repair, we’ll send you the necessary components and walk you through any repair procedure.


  • Moisture/Density Gauge — HS-5001SD121
    • Measures to 12" (300mm) depth in 1" (25mm) increments.
  • Moisture/Density Gauge — HS-5001SD122
    • Measures to 12" (300mm) depth in 2" (50mm) increments.
  • Moisture/Density Gauge — HS-5001SD081
    • Measures to 8" (200mm) depth in 1" (25mm) increments.
  • Moisture/Density Gauge — HS-5001SD082
    • Measures to 8" (200mm) depth in 2" (50mm) increments.
Radioactive Materials Data Needed for License Application
Radioactive 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
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 ISO/99/C66545
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
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)
Displays HS-5001SD:
4 lines x 20 alphanumeric w/ backlit liquid crystal display
Timer Stability  
Power Supply Stability  
Power Source HS-5001SD:
Six alkaline AA-size batteries
Power Consumption HS-5001SD:
Active  —  6.5mA  —  Battery Life  —  1400 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
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 Teflon Impregnated
Post and Frame Computer-Machined 6061-T6 Aluminum, Anodized for Anticorrosion
Index Rod 7075 aluminum, Hard Coated and Teflon Impregnated
Top Shell Injection-Molded Noryl with Integral Color
Bearing Relieved Bronze with Neoprene Seals
Screws/Fittings Stainless Steel and Brass
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 25" 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)
All models Include: Gauge, Reference Standard, Source and Case Certification, Wipe Test Kit, Rod Guide/Scraper Plate, Drill Pin, Four Pound Hammer, Drill Pin Extraction Tool, Zippered Accessory Case, Transit Case, Radiation Safety Manual and Operator’s Manual.