Seco-Larm ST-BL01Q Hi-Speed Latching Tester<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Allows you to verify N.O. and N.C. circuit continuity over durations</li><li>Perfect for troubleshooting security and electrical systems</li><li>Beeps and illuminates LED upon verification</li><li>3 test modes: real-time， auto-reset， latch</li><li>Includes battery and belt clip</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41ubyeno1ZL.jpg" noproxy>