H-B DURAC 45/51 Degree API ASTM 30H Hydrometer (B61893-1100)
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<b>[Product Information]</b><br>
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<li>Range: 45 to 51°; accuracy: 0.1°API; temperature of standardization 60°F/60°F</li>
<li>Length: 163mm (6.4 inches); ASTM number: 30H</li>
<li>Features readings in 0.1 divisions and a metal ballast</li>
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