IIT 16687 7 Blade &amp; 4 Pin Tester，<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Easy to use</li><li>Has a typical lifetime of 10+ years</li><li>Checks if the vehicle's tow circuit is properly configured</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31M6u8%2BOHCL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31%2BgTjfDE-L.jpg" noproxy>