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Model 720A Kelvin-Varley Divider is a high-resolution primary ratio standard with absolute linearity of 0.1 ppm, temperature coefficient of linearity of 0.1 ppm/ C, and self-calibration capability. * 0.1 ppm resolution, seven decades * 0.1 ppm of input absolute linearity * Built-in self calibration bridge * Front panel self-calibration
