This vintage Delco Harrison thermostat tester, model number M13-120, is a rare find for any automotive enthusiast. It comes with its original box, adding to its collectible value. Made in the United States, this item is a must-have for any serious collector of automotive tools and supplies. The brand speaks for itself, making it a reliable addition to any collection. This item is categorized as "Other Diagnostic Service Tools" and "Diagnostic Service Tools" on eBay Motors, proving its worth to any mechanic or car enthusiast. Get your hands on this piece of history before it's gone!

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