---
product_id: 809437
title: "4619 Professional Battery Hydrometer"
brand: "otc"
price: "$52.65"
currency: USD
in_stock: true
category: "Otc"
url: https://www.desertcart.us/products/809437-4619-professional-battery-hydrometer
store_origin: US
region: United States of America
---

# Measures specific gravity 1.100-1.300 Built-in thermometer for temp correction Flexible rubber tip for hard-to-reach cells 4619 Professional Battery Hydrometer

**Brand:** otc
**Price:** $52.65
**Availability:** ✅ In Stock

## Summary

> ⚡ Charge smarter, not harder — the pro’s choice for battery mastery!

## Quick Answers

- **What is this?** 4619 Professional Battery Hydrometer by otc
- **How much does it cost?** $52.65 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/809437-4619-professional-battery-hydrometer)

## Best For

- otc enthusiasts

## Why This Product

- Trusted otc brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Pro-Level Value:** Trusted by automotive pros for decades, this tool delivers expert diagnostics at a price that won’t break your budget.
- • **Ergonomic Access:** Flexible rubber tip design lets you test batteries still mounted in vehicles—no disassembly needed.
- • **Durable Classic Build:** Glass and rubber construction balances vintage reliability with modern usability, backed by a 1-year warranty.
- • **Precision Charge Insight:** Accurately gauges battery health by measuring electrolyte density, ensuring you never miss a failing cell.
- • **Temperature-Adjusted Accuracy:** Integrated thermometer automatically guides you to correct readings, eliminating guesswork in any climate.

## Overview

The OTC 4619 Professional Battery Hydrometer is a precision tool designed to measure the specific gravity of automotive battery electrolyte, providing an accurate state-of-charge reading. Featuring a built-in thermometer for temperature correction and a flexible rubber tip for easy access to hard-to-reach cells, it combines classic glass and rubber construction with professional-grade reliability. Ideal for technicians and enthusiasts seeking precise battery diagnostics and enhanced maintenance efficiency.

## Description

OTC's No. 4619 Professional Battery Hydrometer displays a batteries specific gravity (density) on an easy-to-read float with a scale ranging from 1.100 to 1.300. Hydrometers are used to test the state of charge of a battery cell. This is performed by measuring the density of the electrolyte, which is accomplished by measuring the specific gravity of the electrolyte. The greater the concentration of sulfuric acid, the more dense the electrolyte becomes. This high quality hydrometer includes a built in thermometer that indicates the correction factor - based on specific temperatures - that must be added or subtracted from the float reading to arrive at an accurate specific gravity reading for each battery cell. Features glass and rubber construction with a flexible tip that offers easy access to even hard to reach battery cells while the battery is still in the vehicle. One year limited warranty. Value is at the core of the OTC tool and equipment portfolio. For a simple repair or the most complex drivability concern, these award-winning tools universally solve problems faster, and at better value, than any other product line available. Whether it’s a specialty tool or unique piece of service equipment, OTC provides top solutions to modern automotive service challenges while increasing technicians’ productivity and shop profits.

## Features

- Hydrometers test the state of charge of a battery cell by measuring the specific gravity (density) of the electrolyte - the greater the concentration of sulfuric acid, the more dense the electrolyte becomes
- OTC's Professional Battery Hydrometer displays a batteries specific gravity (density) on an easy-to-read float with a scale ranging from 1.100 to 1.300
- Built in thermometer indicates what must be added or subtracted from the float reading to arrive at an accurate specific gravity reading for each battery cell
- Flexible rubber tip offers easy access to even hard to reach battery cells while the battery is still in the vehicle
- Glass and rubber construction; One year limited warranty

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0050SFVHO |
| Best Sellers Rank | #82,017 in Automotive ( See Top 100 in Automotive ) #97 in Battery Testers |
| Brand | OTC |
| Brand Name | OTC |
| Color | Red |
| Compatible Devices | Automotive Batteries |
| Customer Reviews | 4.1 out of 5 stars 1,137 Reviews |
| Global Trade Identification Number | 00731413039898 |
| Included Components | Battery Tester |
| Item Dimensions | 3.8 x 14.3 x 0.6 inches |
| Item Type Name | Battery Tester |
| Item Weight | 4 ounces |
| Item dimensions L x W x H | 3.8 x 14.3 x 0.6 inches |
| Manufacturer | OTC |
| Measurement Type | Specific Gravity |
| Model | 4619 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Part Number | 4619 |
| Power Source | Battery Powered |
| Style | Classic |
| Style Name | Classic |
| UPC | 731413039898 |
| Unit Count | 1 Count |
| Warranty Description | Glass and rubber construction; One year limited warranty |

## Product Details

- **Brand:** OTC
- **Power Source:** Battery Powered
- **Style:** Classic
- **Color:** Red
- **Item Weight:** 1 Grams

## Images

![4619 Professional Battery Hydrometer - Image 1](https://m.media-amazon.com/images/I/51Etxrz6afL.jpg)

## Questions & Answers

**Q: Is the tip thin enough to go into a motorcycle battery? I bought a cheapie from my auto store that was too wide to fit!**
A: I don't currently have a motorcycle, but I see a problem.  I the tip size may be an issue, but I would have greater concern with the volume of acid to be drawn up.  The glass tube is fairly wide and you need to draw enough acid that to indicator float actually floats.  This is about 3 inches.  I suspect that this may be more than the total volume of a cell.  If you think the volume is OK, you can insert a piece of small plastic tubing in the hydrometer and reach into the battery with that.

**Q: will this hydrometer work for both car batteries and deep cycle batteries?**
A: Yes as long as you have access to the  acid in the battery.

**Q: My hydrometer only reads fair for all of the cells on six different batteries.  I have another older and different type that reads good. Is mine bad?**
A: Batteries are hard to figure out at first. The best advice is probably to compare one or all cells to the others on one battery. Comparing one cell of one battery to one cell of another is not good. I would first read up on batteries in general through facebook or an RV website. The hydrometer is a good unit, but the glass tube is very fragile. Mine was received with the upper portion of the glass crammed into the rubber stop inside the bulb. I had to break it off evenly and repair it with some silicone gasket material. I think you will be impressed if you compare it to one of the plastic ones.

**Q: Your ad states a proud heritage; does this mean this item is specifically made in the United States?**
A: I believe this item is made by Bosch, which has a proud heritage, but is not made in the USA.

## Frequently Bought Together

- OTC 4619 Professional Battery Hydrometer , Red
- LubriMatic 75-033 Battery Filler w/ Rubber Spout, red, 1 Count (Pack of 1)
- EZRED SP101 Battery Hydrometer, Factory

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-10-20*