GE Ruska Instrument Corporation 7250xi High Speed Digital Pr Controller, with RS-232 and IEEE-488 interface, NIST traceable calibration, manual and power cord. p ranges: 20, 50, 100, 300, 500, 1000 and 2500 pg. b ranges: 1.6, 4, 6, 25, 40, 60 and 160 b g