Lisle 24550 Computer Safe Circuit Tester
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<b>[Product Information]</b><br>
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<li>Also indicates polarity</li>
<li>Won't damage sensitive electronic components</li>
<li>Draws less than 21mA at 12 volts DC</li>
<li>Operating range 3-28 volts</li>
<li>The red light indicates positive polarity, green indicates negative polarity</li>
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<img src='http://ecx.images-amazon.com/images/I/31wh2ast%2B-L.jpg'></br>