Thermco GW2501C Combined Form API Hydrometers, -1 to 11° API Range, 0.2° API Division, 0-150°F Temperature Range, 7.5" Length
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<b>[Product Information]</b><br>
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<li>NIST Traceable</li>
<li>Made from the finest materials available; the glass is free from imperfections</li>
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<img src='http://ecx.images-amazon.com/images/I/21YLWqdrt8L.jpg'></br>