This NEW! digital Superficial Rockwell hardness tester with fully automated load/unload procedures affords highly sensitive and accurate readings. Micro computer controlled with USB output to built-in mini printer, the 900-347 digital Rockwell hardness tester offers programmable scale conversions, dwell times and test counter. Capable of testing in the Superficial Rockwell® scales. Automatic conversions to HRC, HRB, HB, HV, HLD and ob.