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🔋 Know your battery’s health at a glance—because downtime is not an option!
The EZRED SP101 Battery Hydrometer is a professional-grade, rugged tool designed for quick and accurate measurement of battery acid specific gravity (1.100–1.300). Ideal for mechanics and technicians, it eliminates complicated readings and temperature corrections, offering universal compatibility and backed by a limited lifetime warranty for dependable, long-term use.





| ASIN | B000JFHMRU |
| Best Sellers Rank | #7,344 in Automotive ( See Top 100 in Automotive ) #10 in Battery Testers |
| Brand | EZRED |
| Brand Name | EZRED |
| Color | Red |
| Compatible Devices | All batteries within the range of 1.100 - 1.300 sg |
| Customer Reviews | 4.6 out of 5 stars 3,413 Reviews |
| Global Trade Identification Number | 00008965001070 |
| Included Components | SP101 |
| Item Dimensions | 0.5 x 11.4 x 1.3 inches |
| Item Type Name | EZRED SP101 Battery Hydrometer |
| Item Weight | 2.4 ounces |
| Item dimensions L x W x H | 0.5 x 11.4 x 1.3 inches |
| Manufacturer | EZRED |
| Measurement Type | Specific Gravity Meter |
| Minimum Operating Voltage | 2.1 volts |
| Model | SP101 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Part Number | SP101 |
| Power Source | Battery Powered |
| Style | 1 pack |
| Style Name | 1 pack |
| UPC | 008965001070 |
| Unit Count | 1 Count |
| Warranty Description | Limited Lifetime |
A**R
Good quality
Good price good quality. Worked well for my project
K**I
Cheap, easy to use battery tester
I use this to check SG off a forklift battery that I'm using in my off-grid solar system. It seems to be working and SG tracks voltage as expected. It's easy to use and does the job. I didn't know how accurate it is as I didn't have anything to compare it to. I have a couple of criticisms, I wish it had numbers marked between fair and good so I don't have to estimate, and I see small cracking around the edges which I know can come from the method used to weld the 2 halves together or if solvent is used to clean it in the manufacturing process, but to be fair, I have also left this under the metal cover of my battery outside, so it has been exposed to the elements and temperature swings below freezing. So far no leaks but even if the long term durability isn't there, it's cheap enough to just buy another one.
G**F
What’s that electrolyte reading?
Works great. Bought this new one since I was needing one. My old one got lost somewhere. Have used it numerous times now and I am not disappointed at all. I recommend this to anyone needing an over handy hydrometer around the shop.
L**N
Perfect, Great value, perfect
Works very well. Excellent build quality. Ease of use and design is good. Able to use as a transfer from one cell to another. I squeeze the top slowly to absorb the material into unit. Extremely sensitive readings with this product which worked great for me. Do not breathe the fumes so this works very well in doing that. Be safe. Wash it up and put unit back into the package it came in. Awesome. Thanks
W**.
Good tool for checking battery acid
Easy to use tool to check your battery acid. Helped with rejuvenating riding mower battery. Price was good but delivery was delayed. Think it was Amazon side. Brick and mortar places had to order and were more expensive.
P**1
Over night with Prime
Thanks Amazon Prime for the over night delivery, you confirmed that my battery's had nothing but water in them, I tried to restore some golf cart Trojan T-105 , never buy a battery powered golf cart, never, gas only, Lithium are junk also, I never have to touch my Yamaha gas cart , the other one has wasted 2,000 in 2 sets of battery's, junk, so any how I tried to restore the T-105 using Project Farm method, youtube,DC welder, etc,etc, could not achieve the correct 6.5 volt charge, and it failed under load, with no reserve capacity, any how , the tester is great, thx's Prime at least your doing what you promised.Also I recommend flush it out with fresh water after testing , you can do what you want...
D**1
★★★★★ How can you maintain a battery without one? ★★★★★
5 Stars A++ RECOMMENDED 👑 VOTE thumbs UP IF YOU FOUND THIS HELPFUL 👑 How can you maintain a battery without one? Charge your battery, then check the condition of the cells. Dead cell means time to replace the battery. Charge your battery at least as often as you change the oil, or at the start of each season. Get a good charging unit to keep your unit up to speed, and get a good load tester and find out if your battery is about to leave you stranded. Auto batteries are designed to operate at full charge around 72F way above that or way below that you are looking at partial capacity. Below 0F is as hard on a battery as 98F, this is why it is a good idea to keep an eye on this especially if you live in an extreme climate, or a tough place that you would not want to be stranded. 1. Schumacher BT-100 100 amp Battery Load Tester 2. Schumacher SSC-1500A-CA Ship 'N' Shore 15 Amp SpeedCharge Charger with Battery Clamps ------------------------PRO TIP-------------------------------- A. Before Charging carefully clean the top of the battery, wiping any grease or dust build up, which believe it or not can slowly discharge your battery. B. If your unit has pop open caps, check the fluid level, add "DISTILLED WATER ONLY" DO NOT OVER FILL!!! Fill just enough to cover the plates or to the bottom of the inner sleeve. Use old E-Z RED to carefully add some fluid. No splashing. Wear gloves and protective goggles. Please. C. After charging check the specific gravity of the battery acid again. (Specific gravity is the ratio of the weight of a volume of the substance to the weight of an equal volume of the reference substance.) This changes as you load the battery up with electrons. I know...Right?? Weird Science..LOL ★★★★★ HIGHLY RECOMMENDED ★★★★★ 5 Stars A++ 👑 VOTE thumbs UP IF YOU FOUND THIS HELPFUL 👑
M**M
Good for getting a rough reading
[edited] Upgrading from 2 to 3 stars. Overall, this tool will do a good job of letting you know whether any of your cells are bad. If that's all you need to know, then it's is a fine product. I found, however, that the readings are not consistent enough to provide accurate measurements. Test after test usually ranges plus or minus a graduation (about .025 each). Previously, I had a complaint that it was difficult to tell if the proper amount of fluid was being used because the meniscus (curvature of the liquid) didn't match with the fill-to line, but was informed that standard practice is to read at the bottom of the meniscus. I may have known that at some point, but certainly forgot about it. So, it turns out I've been using a number of devices incorrectly, but unfortunately with this one the readings are still inconsistent. Regardless, I've found this item to be useful enough that I'll give it a star boost.
K**.
Gehäuse undicht
An sich ein gutes Produkt. Es ist gut ablesbar, für meine Zwecke musste ich den Schlauch abändern. Das Gehäuse war jedoch an der Klebung der Gehäusehälften undicht. Das bedeutet, es zieht beim Einsaugen der Säure Luft. Eventuell durch den Transport verursacht, da nur in einer Papiertüte verschickt. Ich hätte das am liebsten reklamiert, aber durch die lange Lieferzeit habe ich mir die Mühe gespart und stattdessen das Gehäuse geklebt. Funktioniert jetzt wie es soll. Entweder besser verarbeiten oder besser verpacken wäre sinnvoll.
K**L
Will buy again
Very good tester used that style in the shop for years
M**K
جيد
جيد
M**L
Hydrometer a must for battery maintenance
Fast delivery, compact and functions well.
J**O
Equipo de gran ayuda
Excelente equipo para saber la vida útil de tu batería.
Trustpilot
5 days ago
3 days ago