172-868-11A-KA Mitutoyo PH-3515F Optical Comparator with KA DisplayMitutoyo PH 3515F Optical Comparator w 14" Screen Mitutoyo's PH 3515F is a heavy duty, bench top optical comparator that uses a horizontal optical system. This optical comparator includes an 8" x 4" floating type workstage that incorporates linear scales for fast, accurate measurement. The workstage provides high accuracy and can handle a workload of up to 100 lbs. The PH 3515F offers a 14" diameter screen that includes cross hairs for easy alignment