This used Arnold Mfg. Co. cam dwell indicator is an AC tester tool for measuring ignition points in vintage automotive engines. It comes with its original carrying case. The tool provides a practical method for setting the correct dwell angle, which is essential for proper ignition timing and engine performance. Free shipping is available for this item. It is well-suited for automotive mechanics, vintage car restorers, or tool collectors seeking specific diagnostic equipment from a bygone era. Note that this is a used item; its cosmetic and functional condition should be verified. Check the listing for full details and any included accessories. Vintage Arnold Mfg. Co Cam Dwell Indicator AC Tester Tool w/Case. Condition: Used. Listed at 25.00 USD. The Vintage Arnold Mfg. Co Cam Dwell Indicator AC Tester Tool is a diagnostic service tool used for testing ignition systems in automobiles. This tool, designed by the trusted brand Arnold, features a cam-dwell-indicator function to accurately diagnose issues within the ignition system. It comes with a convenient case for safe storage and transportation, making it a practical and essential addition to any mechanic's tool collection.