The Phase II 900-331 hardness tester comprises the very best in "state of the art" design along with dynamic precision only found at Phase II. The Phase 2+ 900331 Rockwell scale hardness tester is easy to operate, yet engineered to obtain highly sensitive and accurate readings. Conforming to ASTM E-18 Rockwell Hardness standards, the Phase II Plus 900-331 tester will offer unmatched repeatability in all standard Rockwell Hardness scales. A perfect, rugged performer suited for any environment including heat treat facilities, tool rooms, workshops, laboratories and inspection labs. Lifetime technical support is included on all Phase II Hardness Testers.