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G91 is a measurement and control electronic for processing a continuous surface on grinding machines. Its use is ideal for both inner and outer surfaces. G91 is the ideal device to combine with K68 and K69 measuring heads for inner and outer diameter measurements. Its operation panel makes it easy for the operation personnel to view and control the process. The front panel is equipped with LEDs, which clearly indicate the current status of the machine grinding process, and further enhanced by a meter real-time display that indicates the grinding margins. All G91 operations can be controlled from the front panel. These include, the pre-adjustment data, measurement setup heads, electronic zero setting, and final dimension adjustments.