Model No. 900-442 is a newly designed, fully automated digital twin Rockwell hardness tester. With closed-loop test force control and a fully automatic Z-axis, it eliminates test error caused by deformation of the frame or workpiece, delivering precise, repeatable results across the full range of Rockwell and Superficial Rockwell scales.

Key features

• Test force closed-loop control
• Automatic tracking and testing — no test error caused by deformation of frame and/or workpiece
• Z-axis moves up and down automatically and automatically applies the preliminary test force
• Selectable conversion charts based upon material per ASTM E140-12b(2019)
• Round part correction factor
• Large touchscreen LCD display with menu operation and complete functions (data processing, hardness conversion between different scales, etc.)
• Data output via USB flash drive
• Precision follows guidelines for GB/T 230.2, ISO 6508-2 and ASTM E18

Applications

Suitable for determining the Rockwell hardness of ferrous and non-ferrous metals as well as non-metal materials. Ideal for quality control in metal heat treatment, material inspection, welding evaluations, production evaluations involving alloys, grade verification for hard plastics, and failure analysis — and especially well suited to the precise measurement of both flat and curved surfaces.

Included accessories

• C-scale Diamond Indenter
• 1/16" Carbide Ball Indenter
• 6 pc NIST/ASTM Certified Test Blocks (3 HRC, 1 HRB, 1 HRN, 1 HRT)
• 6" Flat Anvil
• 2" Flat Anvil
• V-Anvil
• Dust Cover