With extended Z-axis height for tools up to 20 in. long, Model STP-35 Basic and Model STP-35 EzVision include 1 micron Heidenhein glass scales. Thermo-balanced and artificially aged pearlitic cast-iron structure ensures equipment is fully isostatic and will not deform or distort over time or temperature change. Digital tool sensing removes potential for error inherent in manual measurement systems. Episcopy function detects defects by illuminating and magnifying cutting edge.