Battery Hydrometer 1.10–1.30 | Electrolyte Acid Density Tester

Accurately Test Your Car Battery's Electrolyte Density

Keep your lead-acid battery in peak condition with this professional Battery Hydrometer. Designed for measuring the specific gravity (density) of electrolyte fluid in flooded lead-acid batteries, this simple tool helps you determine whether your battery is fully charged, needs charging, or is failing — before you're left stranded.

Key Features

• Precise Measurement Range: Reads electrolyte density from 1.10 to 1.30 SG — covering the full range of typical lead-acid battery states.
• High-Quality Glass + Rubber Construction: Durable glass barrel with a rubber bulb for easy suction, making readings clear and reliable every time.
• Compact & Lightweight: At approximately 275mm (10.8 inches) total length, it's easy to store in a toolbox or glove compartment.
• Simple to Use: No batteries or electronics needed — just insert vertically into the battery cell, squeeze and release the bulb to draw in fluid, and read the float level directly.
• Universal Compatibility: Suitable for standard flooded lead-acid batteries in cars, trucks, motorcycles, boats, and more.

Specifications

What's in the Box?

• 1 × Battery Hydrometer

Pro Tip

A fully charged lead-acid battery should have an electrolyte density of approximately 1.27 SG. Readings consistently below 1.20 may indicate that your battery needs charging or replacement. Regular testing is one of the easiest ways to extend battery life and avoid unexpected breakdowns.

For more information on battery safety and proper maintenance practices, visit the U.S. Consumer Product Safety Commission (CPSC) Battery Safety Resource.

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Frequently Asked Questions

Q: What is a battery hydrometer used for?

A: A battery hydrometer is used to measure the specific gravity (electrolyte density) of the fluid inside a flooded lead-acid battery. This reading tells you the battery's state of charge — a density around 1.27 SG indicates a fully charged battery, while lower readings suggest it needs charging or may be failing.

Q: What types of batteries is this hydrometer compatible with?

A: This hydrometer is designed specifically for flooded (wet cell) lead-acid batteries, commonly found in cars, trucks, motorcycles, marine vessels, and lawnmowers. It is NOT suitable for sealed AGM, gel, or lithium batteries, as those types do not use liquid electrolyte that can be accessed for testing.

Q: How do I use this battery electrolyte density tester?

A: Remove the battery cell cap to expose the electrolyte fluid. Insert the hydrometer tube into the cell, squeeze the rubber bulb, then slowly release it to draw a sample of electrolyte into the glass barrel. Hold the hydrometer vertically and read the float scale at eye level. The number the float rests at indicates the specific gravity (density) of the electrolyte. Rinse the hydrometer thoroughly with water after each use.

Q: Is this hydrometer safe to use?

A: Battery electrolyte is a dilute sulfuric acid solution and can be corrosive. Always wear protective gloves and safety glasses when testing battery fluid, avoid contact with skin and eyes, and keep the hydrometer away from children. Handle with care and wash hands thoroughly after use.