Digital Rockwell Hardness Tester/Load Cell Driven Rockwell Hardness Tester. Model No. 900-415. Features. Load Cell driven system provides precise control of test force application. Automatic conversions to HB, HV, Superficial Rockwell Scales. Touch Screen selectable system. Upper/Lower Limit Settings. Features: Model No. 900-415 Rockwell Hardness Tester. This digital Rockwell hardness tester with fully automated load/unload procedures affords highly sensitive and accurate readings. Micro computer controlled Touch Screen with USB output to flash drive. Utilizing the guidelines of ASTM E-18, the 900-415 digital Rockwell hardness tester offers programmable scale conversions, dwell times, statistical capabilities and test counter. Capable of testing in all of the regular Rockwell hardness scales. Load Cell, Closed Loop, Rockwell Hardness Tester!. Touch Screen Functions w/One Touch Testing Feature!. For full conformance to the latest E18-20 specification, please call 201 962-7373. Direct Loading Method With Load-Cell Instead Of Dead Weight System. High Speed Test Cycle and Extremely Accurate Loading Control. . Automatic conversions to HB, HV, Superficial Rockwell Scales. Touch Screen selectable system. Upper/Lower Limit Settings. Test resolution: 0.01HR Rockwell unit;. Operation temperature:50 Degrees – 95 Degrees F 10 Degrees C – 35 Degrees C. Ambient environment: clean, no vibration, no strong magnetic field, and no corrosive medium;. Power supply:single phase, AC, 110-220 with manual change, 50 – 60Hz, 4A;