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⚡ Charge smarter, not harder — the pro’s choice for battery mastery!
The OTC 4619 Professional Battery Hydrometer is a precision tool designed to measure the specific gravity of battery electrolyte, providing an accurate state-of-charge reading. Featuring a built-in thermometer for temperature compensation and a flexible rubber tip for easy access to hard-to-reach battery cells, it combines durability with professional-grade accuracy. Ideal for vehicle maintenance professionals and enthusiasts aiming to prevent battery failures and optimize performance.





| ASIN | B0050SFVHO |
| Brand | OTC |
| Bullet Point | 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, Hydrometers test the state of charge of a battery cell by measur… |
| Colour | Red |
| Customer Reviews | 4.1 4.1 out of 5 stars (1,089) |
| Global Trade Identification Number | 00731413039898 |
| Is Assembly Required? | No |
| Item Dimensions | 9.7 x 36.3 x 1.5 centimetres |
| Item Package Quantity | 1 |
| Item Weight | 113 g |
| Lamp Warranty | Parts |
| Manufacturer | OTC |
| Manufacturer Part Number | 4619 |
| Measurement Type | Specific Gravity |
| Model Number | 4619 |
| Package Weight | 0.18 Kilograms |
| Power Source | Battery Powered |
| Product Warranty | Limited lifetime warranty |
| Size | Pack of 1 |
| Specification Met | REACH |
| Style Name | Modern |
| Title | OTC 4619 Professional Battery Hydrometer |
| UPC | 731413039898 |
| Unit Count | 1.0 count |
A**R
Just what we needed to test battery acid level!
G**Z
Me permite reparar baterias indicando el nivel de peso del acido. Si deciden comprarlo cuidenlo mucho ya que tanto el pesaacidos como la botella son de vidrio. cuando los adquirí tuve que realizar el cambio ya que me llegó quebrado el pesaacidos.
M**E
Great product and its exactly the same as one I've had for 45 yrs. The old bulb got hard over the years of use and cracked and became none fictional.
A**R
The first time I ordered this item , we sent it to our customer as it is without checking and the customer informed me that the glass is broken . Unfortunately the return window had closed by then . Second time I personally received the item and opened it in front of delivery executive and it was in broken condition again in the same spot . This time item is returned and I am now ordering for the 3rd time . Item seems to be delicate and not upto the mark. Will update rating once item is received in okay condition
A**R
Work as expected I suspect, "Plastic parts" used is of low quality It may not work for long. Better go for other products
Trustpilot
3 days ago
1 day ago