Mitutoyo Digital Protractor with RS-232 Output Features include... 360° Measuring Range (90° x 4) 0.1° Resolution + 0.1° Repeatability Machined aluminum frame. Alternate reference (zero). Reading hold. Simple Calibration requiring no special fixtures. Display remains upright to view at all angles. Mitutoyo Pro 360 Digital Protractor. The Digital Protractor presents inclination values on an easy to read LCD. The measurements are generated by an electronic gravity sensor and processed by the latest low power electronic circuit technology. For SPC output, use the following cable... # 50AAA983A