--- product_id: 809437 title: "OTC 4619 Professional Battery Hydrometer" brand: "otc" price: "1371870₫" currency: VND in_stock: true reviews_count: 13 category: "Otc" url: https://www.desertcart.vn/products/809437-otc-4619-professional-battery-hydrometer store_origin: VN region: Vietnam --- # Measures specific gravity 1.100-1.300 Built-in thermometer for temp correction Flexible rubber tip for hard-to-reach cells OTC 4619 Professional Battery Hydrometer **Brand:** otc **Price:** 1371870₫ **Availability:** ✅ In Stock ## Summary > ⚡ Charge smarter, not harder — the pro’s choice for battery mastery! ## Quick Answers - **What is this?** OTC 4619 Professional Battery Hydrometer by otc - **How much does it cost?** 1371870₫ with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/809437-otc-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. Review: Old school tool at a great price. - I remember a day when these testers where super expensive. Now thanks to time and marketing they are so reasonable. If you do battery service on batteries that can be checked you need this tool. The specific gravity test is a much more accurate way of determining the condition of the battery. One thing to be mindful of. When you are done using it. Carefully take it apart and clean it. Over time the acid from the battery will dry it out and destroy it. This tool goes back to my youth in automotive service. It is well made and works very well. Review: great value but agree it's fragile - great value, well made easy to read -- I think I will be quite happy with this tool. But it is fragile! I read every review here, noted the fragility so I made a nice little case for it from 2" PVC pipe but I still broke the thermometer when I went to disassemble it for cleaning the second time I used it. I think it comes apart easier than others reviews lead one to believe. A little careful rotation of the rubber parts on the glass breaks the rubber free and allow you to carefully slide it off for thorough cleaning. having read the float was quite fragile, I made sure it was laying horizontally and fully in the middle of the glass tube away from the rubber parts I was removing from the glass. but I wasn't thinking about the unsupported thermometer as I twisted that portion and I snapped the tiny tube. (yes I know mercury is dangerous, even the tiny bit in this tiny thermometer - I sealed the remainder with some hot glue because the little bulb of the thermometer penetrates the rubber tip so you have to leave the broken part to seal the hole from dripping electrolyte everywhere). Oh well, where my batteries are mounted, I don't have to deal with huge temperature changes and I can check my SG after the batteries have relaxed for a while on float charge.... the SG scale is quite easy to read but I still made an enlarged version and attached it to my case so I can easily differentiate the numerical value of my actual readings. And be advised the specific gravity of electrolyte varies by battery manufacturer, I was a little surprised to see that my SG target value (what my marine batteries come with) was just a couple tiny marks into the green. ## 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 | #90,420 in Automotive ( See Top 100 in Automotive ) #93 in Battery Testers | | Brand | OTC | | Brand Name | OTC | | Color | Red | | Compatible Devices | Automotive Batteries | | Customer Reviews | 4.1 out of 5 stars 1,136 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 ![OTC 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. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Old school tool at a great price. *by C***N on April 15, 2022* I remember a day when these testers where super expensive. Now thanks to time and marketing they are so reasonable. If you do battery service on batteries that can be checked you need this tool. The specific gravity test is a much more accurate way of determining the condition of the battery. One thing to be mindful of. When you are done using it. Carefully take it apart and clean it. Over time the acid from the battery will dry it out and destroy it. This tool goes back to my youth in automotive service. It is well made and works very well. ### ⭐⭐⭐⭐⭐ great value but agree it's fragile *by K***B on October 21, 2015* great value, well made easy to read -- I think I will be quite happy with this tool. But it is fragile! I read every review here, noted the fragility so I made a nice little case for it from 2" PVC pipe but I still broke the thermometer when I went to disassemble it for cleaning the second time I used it. I think it comes apart easier than others reviews lead one to believe. A little careful rotation of the rubber parts on the glass breaks the rubber free and allow you to carefully slide it off for thorough cleaning. having read the float was quite fragile, I made sure it was laying horizontally and fully in the middle of the glass tube away from the rubber parts I was removing from the glass. but I wasn't thinking about the unsupported thermometer as I twisted that portion and I snapped the tiny tube. (yes I know mercury is dangerous, even the tiny bit in this tiny thermometer - I sealed the remainder with some hot glue because the little bulb of the thermometer penetrates the rubber tip so you have to leave the broken part to seal the hole from dripping electrolyte everywhere). Oh well, where my batteries are mounted, I don't have to deal with huge temperature changes and I can check my SG after the batteries have relaxed for a while on float charge.... the SG scale is quite easy to read but I still made an enlarged version and attached it to my case so I can easily differentiate the numerical value of my actual readings. And be advised the specific gravity of electrolyte varies by battery manufacturer, I was a little surprised to see that my SG target value (what my marine batteries come with) was just a couple tiny marks into the green. ### ⭐⭐⭐⭐ Potential for accurate readings, detailed to use. Has a real glass hydrometer element inside *by A***E on September 24, 2019* I'm familiar with hydrometers. This old-school tester incorporates a glass hydrometer bulb (shipped in a foam wrapping for protection, foam is to be removed BEFORE use). Carefully remove the lower rubber tip - do NOT break the tiny glass thermometer,nor the glass hydrometer bulb. The tool incorporates a small thermometer with scale to temperature-correct your readings for accuracy. The correction is either added to, or subtracted from, the hydrometer float reading, based upon temperature as indicated. This is a non-electronic, old-school analog tool. It does NOT need any batteries BUT you will need adequate illumination, and sufficient visual acuity to read both the hydrometer bulb scale, and the thermometer correction scale numbers - which are quite small. This instrument cannot be use in dark areas without a flashlight, a LED headset is best. If you need glasses for near vision, that also applies. Be aware the hydrometer bulb can rotate/spin inside the fulid tibe so you may have to rotate the tool to read the scale properly. This is just "the way it is" with floating hydrometers - welcome to the science laboratory. We can't comment on the durability of the rubber bulb and tip - (appear to be natural rubber) . We assume like most natural rubber products, the bulb and tip will eventually dry and crack, and possibly at some point in several years, may become unusable. We plan to keep it in a sealed bag, in a cool, dark, protected storage drawer, and possibly treat the exterior rubber surfaces with protectorant spray after rinsing off battery acid. Package labeling states. Made in Taiwan. Internet indicates OTC Tools address as OTC Tools, Bosch Automotive Service Solutions, 28635 Mound Road, Warren, MI 48092 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 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.vn/products/809437-otc-4619-professional-battery-hydrometer](https://www.desertcart.vn/products/809437-otc-4619-professional-battery-hydrometer) --- *Product available on Desertcart Vietnam* *Store origin: VN* *Last updated: 2026-10-04*