The Model 900-345 Surface Rockwell Hardness Tester is used to measure the surface Rockwell hardness value of thin, soft materials. The 900-345 durometer is designed to be durable, providing high sensitivity and accurate measurements. Following the ASTM E-18 Standard for Surface Rockwell Hardness, the 900-345 Rockwell Hardness Tester provides excellent repeatability in all surface Rockwell measurements (see table below). This instrument is suitable for use in any environment, including: heat treatment equipment, tool magazines, workshops, and testing laboratories.

Direct reading from the dial
The indication value is stable and the accuracy is high
Automatic selection and automatic switching of main loads
Implements the American standard ASTM E-18
It can be used in laboratories, workshops, tool rooms, etc
The Hardness Tester 900-345 is used to measure the surface Rockwell hardness value of thin, soft materials
Diamond indenters used in Rockwell N hardness
1.5875mm diameter steel ball indenter
3 HRN standard hardness test blocks
3 HRT standard hardness test blocks
150 mm diameter flat sample stage
63 mm diameter flat sample stage
10mm diameter dot sample platform
Standard V-shaped stage
Accessory box
Dust cover
Blocks, indenters and block sets with NIST/ASTM calibration certificates
Implements the American standard ASTM E18-08B
| Hardness scale | Hardness Tester indenter type r | Initial test force N (kgf) | Total test force N (kgf) | Typical should |
| 15N | 120º diamond cone indenter | 29.42 (3) | 147.1 (15) | The measured material is similar to HRA, HRC, HRD hardness, but the thickness of the measured material is thinner, or the thickness of the hardened layer is thinner. |
| 30N | 120º diamond cone indenter | 29.42 (3) | 294.2(30) | |
| 45N | 120º diamond cone indenter | 29.42 (3) | 441.3(45) | |
| 15T | 1.5875mm diameter steel ball indenter | 29.42 (3) | 147.1 (15) | The measured material is similar to the HRB, HRF, and HRG durometers, but the thickness of the measured material is thinner |
| 30T | 1.5875mm diameter steel ball indenter | 29.42 (3) | 294.2(30) | |
| 45T | 1.5875mm diameter steel ball indenter | 29.42 (3) | 441.3(45) | |
| 15W | 3.175mm diameter steel ball indenter | 29.42 (3) | 147.1 (15) | Very soft wood |
| 30W | 3.175mm diameter steel ball indenter | 29.42 (3) | 294.2(30) | |
| 45W | 3.175mm diameter steel ball indenter | 29.42 (3) | 441.3(45) | |
| 15X | 6.35mm diameter steel ball indenter | 29.42 (3) | 147.1 (15) | |
| 30X | 6.35mm diameter steel ball indenter | 29.42 (3) | 294.2(30) | |
| 45X | 6.35mm diameter steel ball indenter | 29.42 (3) | 441.3(45) | |
| 15Y | 12.7mm diameter steel ball indenter | 29.42 (3) | 147.1 (15) | |
| 30Y | 12.7mm diameter steel ball indenter | 29.42 (3) | 294.2(30) | |
| 45Y | 12.7mm diameter steel ball indenter | 29.42 (3) | 441.3(45) |