E-Z Red SP101 Battery Hydrometer Reviews

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List Price: $11.05
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Spend the couple of extra dollars on this. The wide range of movement on the dial makes it easier to see small differences between individual cells in a battery. It dosn't say so on the web-site, but on the box it states that it self compensating for tempurature.

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Easy to use and quickly shows which battery (and which cells) are good, fair or poor. I have two old golf carts that have questionable batteries, and its always been difficult to determine which battery to replace (other than by age), and when I did this I quickly found the bad battery in each cart, and when replaced greatly improved the charging and charge holding capacity of each GC. For the price, you can't beat it.

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Short of a laboratory grade instrument, this hydrometer gets the job done. I use it to monitor my solar power system battery bank, so it's important that it gives accurate and repeatable measurements. The built-in temperature compensation is a help no need to use cumbersome and confusing compensation charts. My only (small) complaint is that you need to be sure that the device is level when filled with battery acid or the reading will be off a bit. If you pay attention to this detail you'll be fine.

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[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.

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This item turned out to be awesome. Given the price, I thought this was going to be made of cruddy construction, but it's actually a quality tool. The bulb does not come off, and is sealed very well. Easy to rinse.

Just remember to use something harder than your finger to tap on the side of the device to eliminate the bubbles during operation.

I had no problems using this. It worked perfectly for me.

Highly recommended.