OTC 4619 professional battery hydrometer in red for quick in-vehicle electrolyte density readings.
OTC 4619 professional battery hydrometer in red for quick in-vehicle electrolyte density readings.

OTC 4619 Professional Battery Hydrometer (Red) – Battery Specific Gravity Tester

Overview OTC's No. 4619 Professional Battery Hydrometer is designed for automotive and shop environments where a clear,...
Vendor: OTC
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OTC 4619 professional battery hydrometer in red for quick in-vehicle electrolyte density readings.

OTC 4619 Professional Battery Hydrometer (Red) – Battery Specific Gravity Tester

£40.03
OTC 4619 professional battery hydrometer in red for quick in-vehicle electrolyte density readings.

OTC 4619 Professional Battery Hydrometer (Red) – Battery Specific Gravity Tester

£40.03
Description
Description
x

Overview

OTC'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.

What it measures

This 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.

  • Scale spans 1.100–1.300 for clear charge indication
  • Floating indicator provides easy, at-a-glance readings
  • Glass and rubber construction supports durability and precise measurements

Temperature compensation and accuracy

The 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.

  • Temperature-aware readings improve interpretation
  • Designed to perform reliably where conditions vary

In-field usability

The 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.

Warranty and value

With 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.

FAQ

Q: How does the built-in thermometer improve readings?

A: It shows the temperature correction needed to convert the float result into an accurate electrolyte density for each cell.

Q: Where can I use the OTC 4619 Hydrometer?

A: Its design lets you access battery cells in the vehicle via the flexible tip for in-situ testing.

Shipping & Return
Shipping & Return
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Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

Shipping

We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

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