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G91F includes all the features of the G91 and G91S plus a digital feedback function to facilitate online compensation. The digital feedback refers to the workpiece prior to the actual grinding workpiece in process. G91F will receive final size of the already grinded workpiece from the CNC of the grinding machine and G91F will calculate the correct compensation amount accordingly. G91F will automatically adjust its parameters according to the feedback values, so that a higher precision and a better product consistency is achieved. G91F also boasts of a front panel with improved display for optimal operational function.