NDT DLH-100 Leeb Hardness Tester

NDT DLH-100 Leeb Hardness Tester


The design of the DLH-100 is simple to use and is ruggedly built. It easily fits in your hand and is well protected by the black rubber boot included with the instrument. The large and bright LED display is sharp and easy to see in all working conditions. Results can be stored and sent to a PC at a later time or transmitted to a printer. A self-calibration feature allows the user to offset (+/-) a reading to match the hardness of a secondary standard made from your material and / or compensate for probe wear. The DLH-100 is a great value in a Leeb (Dynamic) Hardness Tester.

The keys are well positioned making it easy for the operator to select:

  • Material
  • Probe
  • Probe Orientation
  • Hardness Scale - Leeb, Brinell, Rockwell, etc...
  • Number of Measurements to be Averaged
  • Output Measurements


  • Highly reliable
  • Precision impact value & easy operation
  • Switch freely between 6 hardness scales
  • Equipped with anti-shock jacket
  • High contrast segmented LCD (LED backlit)
  • Compatible with a range of probes, including types D, DC, DL, C, D+15, E and G.
  • Communication software
  • Optional rugged rubber case with kickstand


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 low mass or thickness need to be supported to prevent movement or deflection.


Selection of the material corrects for material type. The following material 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 material 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-100 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-100 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-100 Specifications

Measuring Method Leeb Hardness Method
Hardness Scale HL, HB, HRB, HRC, HV, HS, 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 Device D type impact device standard, optional C/G/DC/DL/D+15
Accuracy ±6HLD(HLD=800), Repeatability<6HLD(HLD=800)
Measuring Direction 360 degree by manual setting
Materials Steel&Cast Steel, Stainless Steel, GC iron, NC iron, Cast Aluminum alloy, Macht metal, Copper-tin alloy, Brass.
Resolution 1HL,1HV,1HB,0.1HRB,0.1HRC,0.1HS
Display High Contrast Segment Liquid Crystal Display (LED Backlight)
Data Memory 100 groups (each group include 1-7 testing result and 1 MEAN value)
Communication USB port (Standard) and Blue tooth (Optional)
Power 2 AA batteries
Temperature -10℃ to +50℃
Size 153mm×76mm×37mm(H×W×D)
Weight 280g include batteries
Standard GB/T 17394-1998, ASTM A956

Kit Includes

  • DLH-100 Instrument
  • D-Probe with Large Support Ring & Cable
  • HLD Calibration Block
  • Small Support Ring
  • Cleaning Brush
  • User's Manual
  • Rubber Boot
  • Carrying Case
  • DataView Software & I/) Cable (Optional)

Optional Accessories

  • Probe Types: D, DC, DL, C, D+15, E, G
  • Spare Probe Cable
  • Support Rings
  • Rugged Rubber Case with Kickstand

Please contact us with any questions that you may have about your application and choice of instrument.

Product Literature

Description Part # Saved Price Select Option Add to
DLH-100 Leeb Hardness Tester HT-SY-DLH100 $925.00
Rugged Rubber Case with Kickstand (DLH-100 / DLH-500) HT-SY-Case $175.00