Leeb Hardness Tester with Tungsten Carbide (Bluetooth, USB)

This easy-to-use Leeb Hardness Tester with Tungsten Carbide (Bluetooth, USB) is used to test the structural integrity of a metal object by applying a definite amount of force on the object and comes with an USB port and thermal printer with Bluetooth module


Key Features

  • Compact and easy to use
  • Fast sampling rate and gives instant readings
  • Built timer allows you time the insulation test
  • Built-in automatic testing processor
  • LCD display with backlight gives exact and clear visible readings
  • Automatic and Manual power down; allows the device to be turned off manually at any time or if no activity is recorded for 5 minutes, the auto power off feature takes over
  • Data hold/recall function to retrieve logged data
  • Low battery alert
  • Thermal printer with Bluetooth
  • USB port



Technical Specifications

Measuring Method Leeb Hardness Testing Method
Hardness Scale HL, HB, HRB,HRC,HV,HS, σb
Measuring Range HLD (200-960) HRC (19.8-68.5) HB (30-651) HV (80-976) HS (26.4-99.5) HRB (13.5-100) σb (375-2639)
Impact Device D type impact device (Standard); Optional C/G/DC/DL/D+15
Accuracy ± 6 HLD (HLD = 800), Repeatability ﹤10 HLD (HLD = 800)
Measuring direction 360 degree by manual setting
Material Steel & Cast Steel, Stainless Steel, GC IRON, NC IRON, Cast Aluminium alloy, Macht metal, Copper-Tin alloy, Brass
Resolution 1HL, 1HV, 1HB, 0.1HRB, 0.1HRC, 0.1HS
Memory 100 groups (each group include 1-7 testing result and 1 AVE value)
Power 2 AA batteries
Working temperature 14 °F ~122 °F (-10 °C~ 50 °C)
Size (H × W × D) 6.02 in × 2.99 in × 1.45 in (153 mm × 76 mm ×37 mm)
Weight 0.61 lbs (280 g) include batteries




  • Installing machinery and Permanent assembly parts
  • Mould cavity
  • Heavy workpieces
  • Failure analysis of pressure vessel, turbine and other equipments
  • Small test area
  • The production line of bearings and other parts
  • Distinguishing the material of the metal material warehouse

Principle of Leeb hardness testing method

The impact body, which is equipped with tungsten carbide, impacts into the work piece and rebounds back. The rebound and impact velocities are measured at the 1 mm point from the work piece in the following way: the integrated permanent magnet will produce directly proportional voltage with the impact velocity. The Leeb hardness values are calculated by the following formula:

HL = 1000 × (Vb/Va)

In which:

HL: Leeb hardness values

Vb: the voltage produced during the rebound of impact body

Va: the voltage produced during the impact of impact body

Voltage features of output signal

The Leeb hardness values can be converted to other hardness scales directly such as HV, HRC, HRB, Hb and HS.


D type impact device

Type of impact devices

Impact devices specifications

Special Impact Device D/DC/DL D+15 C G E
Impact Energy 11 mJ 11 mJ 11 mJ 11 mJ 11 mJ
Mass of Impact Body 0.012 lbs/0.05 lbs (5.5 g/7.2 g) 0.017 lbs (7.8 g) 0.006 lbs (3.0 g) 0.044 lbs (20.0 g) 0.012 lbs (5.5 g)
Test Tip Hardness 1600 HV 1600 HV 1600 HV 1600 HV 1600 HV
Test Tip Diameter 0.11 in (3 mm) 0.11 in (3 mm) 0.11 in (3 mm) 0.19 in (5 mm) 0.11 in (3 mm)
Test Tip Material Tungsten carbide Tungsten carbide Tungsten carbide Tungsten carbide Tungsten carbide
Impact Device Diameter 0.78 in (20 mm) 0.78 in (20 mm) 0.78 in (20 mm) 1.18 in (30 mm) 0.78 in (20 mm)
Impact Device Length 3.38 in/5.78 in/2.95 in (86 mm/147 mm/75 mm) 6.37 in (162 mm) 5.55 in (141 mm) 10 in (254 mm) 6.10 in (155 mm)
Impact Device Weight 0.011 lbs (50 g) 0.176 lbs (80 g) 0.165 lbs (75 g) 0.551 lbs (250 g) 0.176 lbs (80 g)
Max. Hardness of Sample 940 HV 940 HV 1000 HV 650 HV 1200 HV
Average surface roughness Ra: 1.6 µm 1.6 µm 0.4 µm 6.3 µm 1.6 µm
Min weight of sample: of compact shape on solid support coupled on plate > 11.02 lbs (5 kg)

4.4 lbs ~11.02 lbs (2 kg ~ 5 kg)

0.11 lbs ~4.40 lbs (0.05 kg ~2 kg)

> 11.02 lbs (5 kg)

4.40 lbs~11.02 lbs (2 kg ~ 5 kg)

0.11 lbs ~4.40 lbs (0.05 kg ~2 kg)

> 3.30 lbs (1.5 kg)

1.10 lbs ~3.30 lbs (0.5 kg ~1.5 kg)

0.044 lbs ~1.10 lbs (0.02 kg ~0.5 kg)

> 33.06 lbs (15 kg)

11.02 lbs ~ 33.06 lbs (5 kg ~ 15 kg)

1.10 lbs ~11.02 lbs (0.5 kg ~5 kg)

> 11.02 lbs (5 kg)

4.40 lbs ~1.02 lbs (2 kg ~ 5 kg)

0.11 lbs ~4.40 lbs (0.05 kg ~2 kg)

Min. thickness of sample: 0.19 in (5mm) 0.19 in (5mm) 0.03 in (1mm) 0.39 in (10mm) 0.19 in (5mm)


Coupled Min. thickness of layers   >> 0.031 in (0.8 mm) >> 0.031 in (0.8 mm) >> 0.007 in (0.2 mm) >> 0.047 in (1.2 mm) >> 0.031 in (0.8 mm)
Indentation of test tip  
With 300 HV Diameter 0.021 in (0.54mm) 0.021 in (0.54 mm) 0.014 in (0.38 mm) 0.040 in (1.03 mm) 0.021 in (0.54 mm)
Depth 24 µm 24 µm 12 µm 53 µm 24 µm
With 600 HV Diameter 0.021 in (0.54mm) 0.021 in (0.54 mm) 0.012 in (0.32 mm) 0.035 in (0.90 mm) 0.021 in (0.54 mm)
Depth 17 µm 17 µm 8 µm 41 µm 17 µm
With 800 HV Diameter 0.013 in (0.35 mm) 0.013 in (0.35 mm) 0.013 in (0.35 mm) 0.013 in (0.35 mm)
Depth 10 µm 10 µm 7 µm 10 µm
Impact Device applicable scope   DC used for very confined spaces such as holes, cylinders, internal measurement. DL used for extremely confined spaces. D+15 for measuring in grooves, recessed surface.


C used for testing case hardened or thin walled components


G used for solid heavy component, such as rough castings and forgings.


E used for high hardness material


Pre-treatment of Workpiece

Workpiece requirements

Surface roughness requirements

Surface roughness is an important requirement for the surface of the test piece, it should be smooth and no oil should be there or it will cause measurement errors.

Impact Device Type Workpiece surface roughness Ra
D, DC, D+15 2 um
G 7 um
C 0.4 um

Weight requirements

Impact Device Type   Weight   Min. thickness of sample
Needing coupled Needing support No need
D, DC, D15 0.110 lbs – 4.40 lbs (0.05 kg –2kg) 4.40 lbs – 11.02 lbs (2 kg – 5 kg) > 11.02 lbs (5kg) 3
G 1.10 lbs – 11.02 lbs (0.5 kg – 5kg) 11.02 lbs – 33.06 lbs (5 kg – 15 kg) > 33.06 lbs (15kg) 10
C 0.044 lbs – 1.10 lbs (0.02 kg – 0.5 kg) 1.10 lbs – 3.30 lbs (0.5 kg – 1.5kg) > 3.30 lbs (1.5kg) 1

Surface hardened layer

Impact Device Min. depth of surface hardened layer
D, DC, D+15 0.031 in (0.8 mm)
C 0.007 in (0.2 mm)

Curved surface Requirement

The best testing surface of sample is flat. When the curvature radius R of the surface to be tested is smaller than 1.18 in (30 mm) (D, DC, D+15, C, E and DL type of impact device) and smaller than 1.96 in (50 mm) (G type of impact device), the small support ring or the shaped support rings should be chosen.

Support of Test piece

  • The heavy workpiece does not need support.
  • The Mid-heavy workpiece must be placed on a flat, sturdy surface, and placement should be absolutely smooth, without any shaking.
  • Light workpiece must be tightly coupled with the solid support body, the coupling must be smooth, and coupled dosages don’t change too much.

Test direction must be perpendicular to the coupling surface.

  • When the workpiece is a large area of Sheet, Pole and Bending Parts then large weight and thickness may still cause deformation, so reinforcement and support in the rear surface of the test point is necessary.




Turn on the instrument

Press  to power on the instrument, screen will display the default interface for the first time, then power on again will display the last parameters automatically.

Parameters Setting


Press “MTL” button to choose the material, code no. from 0-8

Code Hardness Steel
0 Steel and Cast Steel C
7 SST CrNiMo
8 Forging Steel Cr
9 Alloy Tool Steel

Hardness Scale

Press “HD” to choose the Hardness scale and strength.

Impact devices

Press “Probe” button to select probes.

Impact direction

Press “DIR” button to select impact direction.

Average times

It is very necessary to work out the average measuring values in hardness testing. Different measuring times between 1-7 can be selected according to user`s different requirements

Press “TIME” button to set the impact times from 1-7 which will calculate the AVE value after the certain times.



After finishing the parameters setting start measuring:

  • Load the impact body: Push the loading-tube until contact is fe Then allow it to slowly return to the starting position locking the impact body.
  • Press the impact device support ring firmly on the surface of the sample, the impact direction should be vertical to the testing surface.
  • Press the release button on the upside of the impact device to te The sample and the impact device as well as the operator are all required to be stable now.

  • After testing the tester will display as following

Reject the Gross Error Value

During the measuring process, if the deviation between the measured value and standard value is too big before the mean value displaying, the current measured value can be deleted by pressing “DEL” button, and the current value would be neither stored nor in averaging, the impact times minus one.

Average Value

When the impact times reach the setting parameter “TIME”, then the tester will display the following average value and will show the symbol “Ave”.

3-5 times is usually used in measurement.

Data Saving and Read settings

Storage testing result

Press “MEM” button to set the saving function, the “S” symbol will be shown on the display.

The tester will save testing results automatically, including 7 testing results and 1 average value each group, and total 100 groups can be stored. The values can be stored at any time by press “MEM”.


In saving status, press and hold the “MEM” button to enter the reading mode and the symbol “R” will be showed on the display. At the same time, the first impact value in the recently saved groups will be displayed, press “up” and “down” button to read the saved testing value.

Then press (or long press) “MEM” to quit the storage function, and the symbol “R” disappears.


Press “DEL” button in reading mode to delete one group data. Long press “DEL” button to delete all stored values.

Data Transmission

The data in stored can be transferred from the instrument to a PC via communication software, to save, statistic and analyze the measurement.

Bluetooth and print

Press “Blue Tooth” button to connect with the Thermal Printer then the groups testing data will be printed.

Calibration (Error-correction setting)

Measuring error can be usually caused by test tip abrasion or changing another impact device. So, it is necessary to correct the error to make the measurement accurate.

Press “up” and “down” button at the same time after power on, then the tester will enter calibration mode, the identification of calibration     appears. Impact the standard block continuously until the average values are achieved, then press “up” and “down” button to adjust the value to the standard value, finally press the store button to finish the calibration, the tester will save the data and exit the calibration mode.

If you want to give up the calibration suddenly, please press the “power off” button directly in Calibration mode.

Maintenance & servicing

During the long time use of the instrument, the impact device has been used for 1000-2000 times, therefore using the cleaning brush to clean the tube and impact body is recommended.

  • Unscrew the support ring first, then take out the impact bod
  • Spiral the nylon brush in counter-clock direction into the bottom of the tube and take it out for 5 time
  • Install the impact body and support ring.
  • Release the impact body after use.
  • Any lubricant is absolutely prohibited inside the impact device.


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