Features:
1. The dial will display hardness value directly, indicator responses sensitively, show the hardness value accurately, the test value is more accurate than national standard;
2. One-time casted molding shell, stable structure and it is not easy to be out of shape. It can work under harsh environment; the shell coating adopted car paint technology with white color. it has strong scratch resistance capability and still look bright as new after use many years;
Working principle of Rockwell hardness test:
The Rockwell scale is a hardness scale based on indentation hardness of a material. The Rockwell test determines the hardness by measuring the depth of penetration of an indenter under a large load compared to the penetration made by a preload. There are different scales, denoted by a single letter, that use different loads or indenters. The result is a dimensionless number noted as HRA, where A is the scale letter.

Main application：
Hardened steel, quenched and tempered steel, annealing steel, bearing steel, strip steel, hardened steel sheet, hard alloy, etc.;

Technical parameters：
1. Rockwell scale: HRA,HRB,HRC,HRD,HRE,HRF,HRG,HRH, HRK,HRL,HRM,HRR
2. Preliminary test force: 10Kg(98N)
3. Total test force: 60Kg (588N), 100Kg (980N), 150Kg (1471N)
4. Resolution: 0.5HR
5. Hardness value range: HRA:20～88  HRB:20～100  HRC:20～70
6. Size / weight: Instrument size: 466*238*630mm（L×W×H）/Net Weight: 65kg
7. Test space: Maximum height :170mm
Maximum throat depth:135mm
8. Executive standard: GB/T230.2 , BSEN 6508, ASTM E18 , ISO 6508 , JJG112