Model No. 900-444 is a fully automatic twin Rockwell hardness tester. Test force is applied through a closed-loop control unit with a load cell, DC motor, and electronic measurement and control unit — replacing traditional dead weights for highly accurate measurements (to within 0.5%) at all test loads.

Key features

• Closed-loop load cell test-force control — accurate to 0.5% at all test loads
• Simple plug-and-play installation vs. traditional dead-weight machines
• Automated Z-axis: press START once and the full test cycle completes automatically, regardless of sample size, position, or distance from the indenter
• Higher precision than handwheel-lifting / dead-weight machines affected by user interaction
• Extended dolphin nose allows 11.8" vertical test height and 8.6" throat depth
• Built-in micro-printer
• Adjustable dwell time (0–99 s); automatic conversions to Brinell and Vickers

Applications

Suitable for determining the Rockwell hardness of ferrous and non-ferrous metals as well as non-metal materials — quality control for heat treatment, material inspection, welding evaluation, and failure analysis.