Battery Hydrometer – Electrolyte Specific Gravity Tester

Quickly Check Your Battery's Electrolyte Health

Keep your car, truck, boat, or any lead-acid battery in peak condition with this professional-grade Battery Hydrometer & Specific Gravity Tester. 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.

Key Features

• Accurate Specific Gravity Readings: Measures electrolyte density across a range of 1.10–1.30, giving you precise data on your battery's charge state. Optimal electrolyte density is typically around 1.27.
• High-Quality Glass & Rubber Construction: 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.
• Lightweight & Portable: At approximately 275 mm (10.8 in) in length, this hydrometer is slim and lightweight — easy to store in your toolbox, glove compartment, or garage shelf.
• Simple to Use: 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.
• Wide Compatibility: Works with virtually all standard lead-acid batteries found in cars, trucks, motorcycles, boats, RVs, and golf carts.

Specifications

What's in the Box

• 1 × Battery Hydrometer & Specific Gravity Tester

Related Products You May Like

• 0-60MPa Pressure Gauge for S60H Diesel Injector Nozzle Tester
• 1-Inch Threaded Brass Ball Valve – Water, Gas & Oil Flow Control

Learn More About Battery Maintenance

For 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.

Learn more: Pico Technology

Frequently Asked Questions

Q: What is a battery hydrometer used for?

A: 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.

Q: What types of batteries can this hydrometer test?

A: 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.

Q: How do I read the specific gravity on this hydrometer?

A: 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.

Q: Is this hydrometer reusable?

A: 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.