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Hydrometers test the state of charge of a battery cell by measuring the specific gravity density of the electrolyte the greater the concentration of sulfuric acid, the more dense the electrolyte becomesOTCs Professional Battery Hydrometer displays a batteries specific gravity density on an easytoread float with a scale ranging from 1.100 to 1.300Built in thermometer indicates what must be added or subtracted from the float reading to arrive at an accurate specific gravity reading for each battery cellFlexible rubber tip offers easy access to even hard to reach battery cells while the battery is still in the vehicleGlass and rubber construction One year limited warranty MORE DETAILS asin B0050SFVHO bestsellersrank 56,026 in Automotive See Top 100 in Automotive 73 in Battery Testers brandname OTC color Red compatibledevices Automotive Batteries customerreviews 4.1 4.1 out of 5 stars 1,138 4.1 out of 5 stars globaltradeidentificationnumber 00731413039898 includedcomponents Battery Tester itemdimensions 3.8 x 14.3 x 0.6 inches itemtypename Battery Tester itemweight 4 ounces manufacturer OTC measurementtype Specific Gravity model 4619 numberofitems 1 numberofpacks 1 partnumber 4619 powersource Battery Powered stylename Classic unitcount 1 Count upc 731413039898 warrantydescription Glass and rubber construction One year limited warranty
