The best quality electrical circuit tester available for checking 6 and 12 volt systems. Made to last longer than anyone"s lifetime! Use it to troubleshoot electrical circuits like any other circuit tester, but it is especially valuable because it will fit and work in confined crowded areas like under hoods and dashboards of modern cars and trucks. • 6" ground wire remains flexible in cold temperatures • Checks 6 and 12 volt systems • Special overbite alligator clip designed to stay put! • Sharp, nickel plated piercing probe