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!

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.

will this hydrometer work for both car batteries and deep cycle batteries?

Yes as long as you have access to the acid in the battery.

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?

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.

Your ad states a proud heritage; does this mean this item is specifically made in the United States?

I believe this item is made by Bosch, which has a proud heritage, but is not made in the USA.

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4619 Professional Battery Hydrometer

Product ID: 809437

Details

Brand
OTC
Power Source
Battery
Style
Classic
Color
Red
Item Weight
1 Grams

⚖️Measures specific gravity 1.100-1.300

🌡️Built-in thermometer for temp correction

🛠️Flexible rubber tip for hard-to-reach cells

VT10455

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Description

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

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.

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.

Specifications

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

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VT10455

Duties & taxes included

In stock

Sold byAmazon VanuatuDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Vanuatu.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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The customer service exceeded my expectations. Perfect for buying products you can't find elsewhere.

1 week ago

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Customer service was outstanding when I had questions about the product.

2 days ago

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