AJH360 leeb hardness tester

Working Principle

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 1mm 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×( V b / 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

pic 2
The Leeb hardness values can be converted to other hardness scales directly, such as HV, HRC, HRB, HB and HS.



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 : less 6HLD (HLD=800)
Measuring Direction 360 degree by manual setting
Material 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)
Printer Thermal Printer with blue tooth (optional)
Power 2 AA batteries  
Working -10°C to +50°C  
Size 153 × 76×37 (mm) (H×W×D)  
Weight 280g include batteries  
Standard GB/T 17394-1998, ASTM A956

leeb hardness tester




Standard Configuration                                                     Optional Configuration

AJH360 Main Unit     Impact Device: D/C/G/DC/DL/D+15
D Type Impact Device Standard Test Block
Standard Test Block     Blue tooth module & Thermal Printer
Rubber Sheath     Belt
Small Support Ring     Standard Support Ring
Cleaning Brush     Small Support Ring
2 AA Batteries     Special Support Ring
Data Software      
Communication Cable  
Operating Manual      
Instrument Case