Home > About PlusModels M40 Circuit Tester Dated 1976 For Sale When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network. M40 Circuit Tester Dated 1976: $59.99 Missing cap on one side. Other Related Items: Related Items:M40 Circuit Tester Dated 1976$59.99M40 tester for Claymore Clacker M57$149.99 Leave a Reply Cancel reply You must be logged in to post a comment.