Battery Hydrometer 1.10–1.30 Electrolyte Acid Density Tester

Test Your Battery Health in Seconds

Keep your lead-acid batteries performing at their best with this professional Battery Hydrometer Electrolyte Density Tester. Whether you're checking your car, truck, motorcycle, or any flooded lead-acid battery, this compact glass hydrometer gives you accurate, at-a-glance readings so you know exactly when it's time to top up, charge, or replace your battery.

Made in Mainland China.

Why You Need This Hydrometer

The electrolyte density of a flooded lead-acid battery is one of the most reliable indicators of its charge state and overall health. A fully charged battery typically reads around 1.27 g/mL — and this hydrometer's 1.10–1.30 range covers everything from a deeply discharged to a fully charged cell. Stop guessing and start testing with a tool trusted by mechanics and DIY enthusiasts alike.

Key Features

• Professional-Grade Accuracy: Measures electrolyte density from 1.10 to 1.30 — ideal for all standard flooded lead-acid batteries.
• High-Quality Glass + Rubber Construction: The clear glass tube makes it easy to read the float level, while the rubber bulb provides a firm, comfortable grip for safe suction.
• Lightweight & Portable: At approximately 275mm (10.8 inches) long, it's slim enough to store in your toolbox, glove compartment, or garage shelf.
• Simple to Use: Just insert the tip into the battery cell, squeeze and release the bulb to draw up electrolyte, and read the density value directly from the floating scale — no electronics, no batteries required.
• Wide Compatibility: Works with any flooded lead-acid battery — cars, trucks, motorcycles, RVs, boats, and more.

Specifications

What's in the Box

• 1 × Battery Hydrometer (1.10–1.30 Range)

Safety Note

Battery electrolyte contains sulfuric acid. Always wear protective gloves and safety glasses when testing. For guidance on safe battery handling, refer to the U.S. Consumer Product Safety Commission (CPSC) Battery Safety Guidelines.

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Learn more: Hydrometer

Frequently Asked Questions

Q: What type of batteries can I test with this hydrometer?

A: This battery hydrometer is designed specifically for flooded lead-acid batteries — the type commonly found in cars, trucks, motorcycles, marine vessels, and RVs. It is not suitable for sealed AGM, gel-cell, or lithium-ion batteries, as those do not have accessible liquid electrolyte.

Q: What electrolyte density reading indicates a fully charged battery?

A: A fully charged lead-acid battery typically shows an electrolyte density of approximately 1.265–1.280 g/mL. A reading below 1.20 generally indicates the battery is significantly discharged and may need charging or replacement. This hydrometer's 1.10–1.30 range covers the full spectrum from discharged to fully charged.

Q: Is this hydrometer easy to use for beginners?

A: Yes! Simply insert the nozzle tip into an open battery cell, squeeze the rubber bulb, then slowly release it to draw electrolyte up into the glass tube. The internal float will rise to a level corresponding to the fluid's density — read the number at the liquid surface line. Always wear gloves and eye protection when working with battery acid.

Q: How do I clean the hydrometer after use?

A: After each use, draw in a small amount of clean distilled water, then expel it to flush out any remaining acid. Repeat a couple of times. Store the hydrometer in a dry, safe place away from direct sunlight to extend its lifespan.