The Ultracomp on-machine form measurement system from Precitech features corrective form error compensation, enabling cost-effective form measurement of continuous, on-axis aspheric components. The device's electronics are mounted within the machine's controller. A precise air-bearing LVDT probe is mounted next to the cutting tool and measures the form accuracy of the machined workpiece. The system includes software that processes measured data, compares it with the ideal surface profile, presents the form error on the machine controller screen and generates an error-corrected toolpath program. Applications include single-point diamond turning and precision grinding.