OTC 4619 Professional Battery Hydrometer , Red

OTC's No. 4619 Professional Battery Hydrometer displays a batteries specific gravity (density) on an easy-to-read float with a scale ranging from 1.100 to 1.300. Hydrometers are used to test the state of charge of a battery cell. This is performed by measuring the density of the electrolyte, which is accomplished by measuring the specific gravity of the electrolyte. The greater the concentration of sulfuric acid, the more dense the electrolyte becomes. This high quality hydrometer includes a built in thermometer that indicates the correction factor - based on specific temperatures - that must be added or subtracted from the float reading to arrive at an accurate specific gravity reading for each battery cell. Features glass and rubber construction with a flexible tip that offers easy access to even hard to reach battery cells while the battery is still in the vehicle. One year limited warranty. Value is at the core of the OTC tool and equipment portfolio. For a simple repair or the most complex drivability concern, these award-winning tools universally solve problems faster, and at better value, than any other product line available. Whether it's a specialty tool or unique piece of service equipment, OTC provides top solutions to modern automotive service challenges while increasing technicians' productivity and shop profits.