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Digital Timing Light No. CP7529 from Actron in Cleveland, Ohio, retails for about $115 and contains several features that make it a useful tool to any tuner. It boasts a digital LED display that shows engine speed up to 9,999 rpm and spark timing that's fully adjustable to 0.1 degree at the push of a button. We've found its calibration to be very accurate, and, according to Actron, its digital software is specifically designed to work with many popular DIS-type ignition systems like those from MSD.