Hardness value of Leeb
standard test block
Error of
displayed value
Repeatability of
displayed value
760±30HLD ±6 HLD 10 HLD
530±40HLD ±10 HLD 10 HLD
3.1.4 Measuring range：170～960HLD；
3.1.5 Measuring direction：360°；
3.1.6 Scales：HL、HB、HRB、HRC、HV、HS；
3.1.7 Display：128×32 dot matrix LCD；
3.1.8 Data memory：270 average data in 9 files；
3.1.9 Upper and lower limit setting：same to measuring range；
3.1.10 Power：AAA（7#）1.5V 2pc；
3.1.11 Continual working time ：about 150 hours（without backlight）；
3.1.12 Communication interface：USB2.0.
3.2 Dimension and weight
3.2.1 Dimension:155mm×55mm×25mm
3.2.2 Weight: about 166g.
4 Using
4.1 Preparation before using
4.1.1Preparation for sample surface
Preparation for sample surface should conform to the relative requirement in figure 3.
●In the preparation process for sample surface, the hardness effect of being heated or cold
processing on the surface of sample should be avoided；
●Too big roughness of the measured surface could cause measure error. So, the measured surface
must be metallic luster, smoothing and polish, without oil stain；
●Curved surface: The best testing surface of sample is flat. When the curvature radius R of the
surface to be tested is smaller than 30mm，the small support ring or the shaped support rings
should be chosen, see figure 2.
Figure 2
●Support of test sample
Support is not necessary for heavy sample.
Medium-weight parts must be set on the smoothing and stable plane. The sample must set
