Addtional Features: 17 Standard resistors in one enclosure; decade values from 1.0 ohm to 100 Mohms, 1.9 multiples from 1.9 ohms to 19 Mohms True passive resistors for low noise and offset Midband accuracy of 8 ppm 4-wire or 2-wire operation Easy data entry for test lead compensation, Automatic meter error calibration, and HP-IB programmable  The 5450A Resistance Calibrator is designed to verify the resistance-measuring accuracy of precision multimeters, either manually or as part of an automated calibration process. It compliments the 5440A and 5442A Direct Voltage Calibrators.