NDT DLH-500 Leeb Hardness Tester

NDT DLH-500 Leeb Hardness Tester


The DLH-500 is a simple to use and ruggedly built hardness tester. It easily fits in your hand and is well protected by the black rubber boot included with the instrument. The large, bright color screen is sharp and supports multiple interface views, and displays Leeb + 2 Hardness Conversions on one screen. Results can be stored and sent to a PC at a later time with the communication software.

Features Graphing with Hi/Lo Tolerances:

  • Data: Can hold up to 11,000 sets of measurements
  • Last 8 measurements
  • Min / Max Measurements
  • N Measurements
  • Average
  • Leeb + 2 Hardness Conversions


  • Big bright color screen
  • Stable & precision readings
  • 3 hardness scales are displayed in same screen
  • Bold bid figure display
  • Visual hardness curve display
  • Larger data logger & simple storage interface
  • Equipped with communication software
  • Compatible with a range of probes, including types D, DC, DL, C, D+15, E and G.

How Does It Work?

A spring in the probe projects the tungsten carbide ball tipped indenter at the test piece. Impact velocity is measured immediately prior to impact and then on rebound. The quotient is computed and displayed as the Leeb Hardness Value. On hard materials, the rebound velocity will be higher than that from softer materials, which will absorb more of the impact energy.

For a correct and repeatable measurement, certain conditions must be met:

  • The material must be smooth and free of paint, rust, oxide, etc.
  • The grain size of the test part must be small in relation to the indentation size.
  • The material cannot move or be deflected by the impact of the indenter.
  • Correction factor must be applied for the material's elastic modulus.
  • Correction for the effect of gravity must also be made.

Testing Parameters


The test piece surface needs preparation by filing, sanding or grinding. As a general rule, if you drag your thumbnail across the surface and it drags, the surface is too rough.

Grain Structure

Materials such as cast iron, that have a coarse (large) grain structure, will cause inconsistent measurements. The use of a much larger indenter "G" probe will often correct for this condition.

Thickness & Mass

Test parts that have a low mass or thickness, need to be supported to prevent movement or deflection.


Selection of the material corrects for material type. The following materials can be selected: Steel / Cast Steel, Gray Cast Iron, Nodular Cast Iron, Cast Aluminum, Brass, Bronze, Copper, Stainless Steel, Forged Steel and Tool Steel*

*Leeb measurements are affected by the materials elasticity. To a large degree this is taken care of by selecting the most similar material type from the Material list. If you find that your measurements are a bit high or low, it is because the built-in correction factor does not match your material. You can try a different material to see if this gets you closer to a correct measurement. You can also use a known hardness sample of your test material (having enough mass and thickness) to determine the +/- error and then adjust the reading to match using the Calibration facility.

Probe Position

Set; Up, Down, Sideways, 45° up or 45° down


The DLH-500 is supplied with a type "D" General Purpose Probe. It can be used with types: D, DC, DL, C, D+15, E and G. The DLH-500 is compatible with most manufacturers' probes including EquoTip.

  • D Type - A general purpose impact probe, suitable for the majority of hardness measurements with a wide measuring range.
  • C Type - A smaller indentation and covers a slightly wider hardness range compared to Type D, but requires a better surface finish.
  • DC Type - Used in confined spaces like holes, cylinders, or inside of assembled machines.
  • G Type - Used in heavy coarse grained castings and forgings.
  • DL Type - A narrow profile impact probe for use in confined spaces like the base of grooves, drill holes, and gears.

Technical Specifications

DLH-500 Specifications

Display High-Definition 2.4" IPS Display
Measuring Method Leeb Hardness Testing Method,Impact Type
Hardness Scale HL, HB, HRB, HRC, HV, HS, Strength (σb)
Measuring Range HLD(200-960) HRC(19.8-68.5)HRB(13.5-100) HB(30-651)HV(80-976) HS(26.4-99.5)σb(375-2639)
Impact Devices D type impact device (Standard); Interchangeable D/DC/DL type impact device (Optional)
Accuracy Measuring Error:±6HLD (HLD=800), Repeatability:±6HLD (HLD=800)
Measuring Direction 360 degree
Material Steel & Cast Steel, Stainless Steel, GC IRON, NC IRON, Cast Aluminum alloy, Copper-zinc alloy, Copper-tin alloy, Brass, Forged Steel, Alloy Tool Steel
Resolution 1HL,1HV,1HB,0.1HRB,0.1HRC,0.1HS
Language Multiple languages
Software Standard LmView software, for management, archiving and printing the measurement data
Power Two Alkaline battery
Data Memory 200 Files, 11000 Groups (each group includes 1-8 testing values and 1 average value)
Temperature -10℃~ +50℃
Size 153mm×76mm×37mm(H×W×D)
Weight 280g include batteries
Standard GB/T 17394-1998,ASTM A956

Kit Includes

  • DLH-500 Leeb Hardness Tester
  • D-Probe with Connector Cable
  • Standard Hardness Test Block
  • Software
  • USB Cable
  • Support Ring
  • Cleaning Brush
  • Packing Files
  • Instrument Case

Optional Accessories

  • Impact Device: D/C/G/DC/DL/D+15
  • Leeb Hardness Test Block
  • Rugged Rubber Case with Kickstand
  • Belt
  • Standard Support Ring, Small Support Ring, or Special Support Ring
Description Part # Saved Price Select Option Add to
DLH-500 Leeb Hardness Tester HT-SY-DLH500 $1,125.00
Rugged Rubber Case with Kickstand (DLH-100 / DLH-500) HT-SY-Case $175.00