{"product_id":"otc-4619-professional-battery-hydrometer-red-battery-specific-gravity-tester","title":"OTC 4619 Professional Battery Hydrometer (Red) – Battery Specific Gravity Tester","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eOTC's No. 4619 Professional Battery Hydrometer is designed for automotive and shop environments where a clear, hands-on read is essential. The instrument assesses the battery's health by measuring the electrolyte's specific gravity, a property that shifts with the concentration of sulfuric acid. Readings are displayed on a transparent float that travels along a scale from 1.100 to 1.300, providing a straightforward gauge of charge state across individual cells. The device's compact red body keeps it visible in crowded toolboxes, and the combination of glass and rubber components offers both precision and resilience for daily service tasks. The hydrometer is built to be accessible during in-vehicle checks, reducing the need to disconnect or remove batteries in many common service scenarios. A one-year limited warranty backs the tool as part of OTC's value-focused lineup.\u003c\/p\u003e\n\u003ch3\u003eWhat it measures\u003c\/h3\u003e\n\u003cp\u003eThis instrument determines charge state by density: higher acid concentration makes the electrolyte denser, which shifts the float upward on the scale. A quick glance at the float, when paired with temperature data, helps you interpret results without fully disassembling a battery.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eScale spans 1.100–1.300 for clear charge indication\u003c\/li\u003e\n  \u003cli\u003eFloating indicator provides easy, at-a-glance readings\u003c\/li\u003e\n  \u003cli\u003eGlass and rubber construction supports durability and precise measurements\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTemperature compensation and accuracy\u003c\/h3\u003e\n\u003cp\u003eThe built-in thermometer shows the temperature correction factor that must be added or subtracted from the float reading to arrive at an accurate specific gravity for each cell. This helps refine readings across a range of ambient conditions, from a cool shop to a warmer job site.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTemperature-aware readings improve interpretation\u003c\/li\u003e\n  \u003cli\u003eDesigned to perform reliably where conditions vary\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eIn-field usability\u003c\/h3\u003e\n\u003cp\u003eThe flexible rubber tip can reach hard-to-access battery cells while the battery remains in the vehicle, reducing the need for removal in many scenarios. The tool’s compact form and clear display make it a practical companion for busy garages, mobile repairs, and routine checks.\u003c\/p\u003e\n\u003ch3\u003eWarranty and value\u003c\/h3\u003e\n\u003cp\u003eWith a one-year limited warranty, OTC emphasizes value in its tool portfolio. This hydrometer supports quick assessments and repeatable readings, helping professionals streamline diagnostics and maintain productive workflow without compromising reliability.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How does the built-in thermometer improve readings?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It shows the temperature correction needed to convert the float result into an accurate electrolyte density for each cell.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Where can I use the OTC 4619 Hydrometer?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Its design lets you access battery cells in the vehicle via the flexible tip for in-situ testing.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"OTC","offers":[{"title":"Default Title","offer_id":42469350539349,"sku":"B0050SFVHO","price":40.03,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0632\/3270\/4597\/files\/otc-4619-professional-battery-hydrometer-red.jpg?v=1778091365","url":"https:\/\/plentytorque.co.uk\/products\/otc-4619-professional-battery-hydrometer-red-battery-specific-gravity-tester","provider":"PlentyTorque","version":"1.0","type":"link"}