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