{"product_id":"battery-hydrometer-electrolyte-specific-gravity-tester-car-truck-boat","title":"Battery Hydrometer – Electrolyte Specific Gravity Tester","description":"\n\u003ch2\u003eQuickly Check Your Battery's Electrolyte Health\u003c\/h2\u003e\n\u003cp\u003eKeep your car, truck, boat, or any lead-acid battery in peak condition with this professional-grade \u003cstrong\u003eBattery Hydrometer \u0026amp; Specific Gravity Tester\u003c\/strong\u003e. Designed for both mechanics and everyday drivers, this compact glass hydrometer gives you fast, accurate readings of your battery's electrolyte density — so you always know whether your battery is fully charged, needs attention, or is time for a replacement.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAccurate Specific Gravity Readings:\u003c\/strong\u003e Measures electrolyte density across a range of \u003cstrong\u003e1.10–1.30\u003c\/strong\u003e, giving you precise data on your battery's charge state. Optimal electrolyte density is typically around 1.27.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-Quality Glass \u0026amp; Rubber Construction:\u003c\/strong\u003e The clear glass tube allows for easy, unobstructed reading of the internal float scale, while the durable rubber bulb provides a secure, comfortable squeeze for drawing fluid.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLightweight \u0026amp; Portable:\u003c\/strong\u003e At approximately \u003cstrong\u003e275 mm (10.8 in)\u003c\/strong\u003e in length, this hydrometer is slim and lightweight — easy to store in your toolbox, glove compartment, or garage shelf.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSimple to Use:\u003c\/strong\u003e Just immerse the tip vertically into the battery cell or a container with battery fluid, squeeze the bulb, and read the density directly from the float scale — no calibration needed.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Compatibility:\u003c\/strong\u003e Works with virtually all standard lead-acid batteries found in cars, trucks, motorcycles, boats, RVs, and golf carts.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGlass + Rubber\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMeasurement Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.10 – 1.30 specific gravity\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTotal Length\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApprox. 275 mm \/ 10.8 in\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × Battery Hydrometer \u0026amp; Specific Gravity Tester\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/0-60mpa-pressure-gauge-s60h-diesel-injector-nozzle-tester-8000psi\"\u003e0-60MPa Pressure Gauge for S60H Diesel Injector Nozzle Tester\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-inch-threaded-brass-ball-valve-water-gas-oil-flow-control\"\u003e1-Inch Threaded Brass Ball Valve – Water, Gas \u0026amp; Oil Flow Control\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eLearn More About Battery Maintenance\u003c\/h3\u003e\n\u003cp\u003eFor best practices on vehicle electrical systems and battery safety, visit the U.S. Consumer Product Safety Commission (CPSC) for consumer safety guidance on automotive batteries and charging equipment.\u003c\/p\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Pico_Technology\" target=\"_blank\" rel=\"noopener\"\u003ePico Technology\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is a battery hydrometer used for?\u003c\/h4\u003e\n\u003cp\u003eA: A battery hydrometer measures the specific gravity (density) of the electrolyte solution inside a lead-acid battery. This reading tells you how charged the battery is — a specific gravity reading near 1.27 typically indicates a fully charged cell, while lower values suggest the battery may be partially or fully discharged.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What types of batteries can this hydrometer test?\u003c\/h4\u003e\n\u003cp\u003eA: This hydrometer is compatible with all standard flooded lead-acid batteries, including those found in cars, trucks, motorcycles, boats, marine vessels, RVs, and golf carts. It is not suitable for sealed AGM or gel-cell batteries.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How do I read the specific gravity on this hydrometer?\u003c\/h4\u003e\n\u003cp\u003eA: Insert the hydrometer tip into the battery cell, squeeze and release the rubber bulb to draw in electrolyte fluid, then hold it vertically and read the number on the float scale at eye level. The float will rest at a number between 1.10 and 1.30 — the higher the number, the denser and more charged the electrolyte.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is this hydrometer reusable?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. After each use, rinse the glass tube thoroughly with clean water to remove any battery acid residue, then allow it to dry before storing. Proper care will extend the life of the tool significantly.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is a battery hydrometer used for?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A battery hydrometer measures the specific gravity (density) of the electrolyte solution inside a lead-acid battery. This reading tells you how charged the battery is — a specific gravity reading near 1.27 typically indicates a fully charged cell, while lower values suggest the battery may be partially or fully discharged.\"}}, {\"@type\": \"Question\", \"name\": \"What types of batteries can this hydrometer test?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This hydrometer is compatible with all standard flooded lead-acid batteries, including those found in cars, trucks, motorcycles, boats, marine vessels, RVs, and golf carts. It is not suitable for sealed AGM or gel-cell batteries.\"}}, {\"@type\": \"Question\", \"name\": \"How do I read the specific gravity on this hydrometer?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Insert the hydrometer tip into the battery cell, squeeze and release the rubber bulb to draw in electrolyte fluid, then hold it vertically and read the number on the float scale at eye level. 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Proper care will extend the life of the tool significantly.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/oasis-select.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Car \u0026 Auto\", \"item\": \"https:\/\/oasis-select.com\/collections\/car-auto\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"Battery Hydrometer – Electrolyte Specific Gravity Tester\", \"item\": \"https:\/\/oasis-select.com\/products\/battery-hydrometer-electrolyte-specific-gravity-tester-car-truck-boat\"}]}\u003c\/script\u003e","brand":"Oasis Select","offers":[{"title":"A","offer_id":47748930306153,"sku":"14:173#A","price":11.33,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0679\/7931\/3257\/files\/Sc6d3c53d1d4e45d5853768aa00c7d5cdF.webp?v=1783090478","url":"https:\/\/oasis-select.com\/products\/battery-hydrometer-electrolyte-specific-gravity-tester-car-truck-boat","provider":"Oasis Select","version":"1.0","type":"link"}