Brake Fluid Liquid Tester, Auto Brake Diagnostic Testing Tool, Oil Moisture Analyzer with 5 LED Indicators, Auto Brake Diagnostic Checker Tool for DOT3 DOT4 Brake Fluid，Father'Day Gift

Works as advertised. Battery cover a little hard to remove. No complaints.

This tool makes me money for such a small investment. Contamination of brake fluid from moisture is not good. I've seen components corrode and break on older vehicles. I've pressurized vehicles and bledd bleeder screws that have not gotten regular brake flushes and the moisture content is almost always present I'm the master cylinder after using two or three quarts and the fresh fluid. usually the fluid in the master cylinder stays dark in color and I'm telling you, the fluid coming out of the bleeder screws looks clean. I'm going to begin testing the fluid coming out of the bleeder screws if they are convenient to catch and if the environment isn't excessively humid. Anyways, the way I test the pen is test fresh brake fluid in a small sample then spray a mist of water with a sprayer bottleand monitor moisture ratings with the pen. I understand you can test brake fluid with a multimeter as well but this is so cheap and convenient. This brake fluid tester and then a good flare wrench set and l maybe even offset/modified offset wrenches just in case could be good for not having to remove a tire to open bleeder screws on vehicles equipped with electronic parking brake systems. I'm paid .5 labor which means the tool pays for itself after the first brake flush, so it's a heavy hitting money tool. It's very good guys and gals. Like an amazing tool. I like to purchase a new one every few months cause I basically test every vehicle during regular maintenance. Once it's 4% or more then I suggest doing the maintenance. I've noticed vehicles who have regular flushes then the master cylinder is usually able to stay clean and keep moisture saturation low. There's only one vehicle I tested that had absolutely perfect brake fluid inside the master cylinder which happened to be a Mercedes that likely recently had a brake flush. I was impressed.

I use this tool on every vehicle inspection. Just because the fluid LOOKS bad,it doesn't mean it always is. This can save customers money if it's tight. This is a tool mainly used to sell brake fluid flushes, though. It tells you the percentage of water that makes up the fluid. Brake fluid is hydroscopic. This means that it'll absorb water from the environment over time and it begins to turn acidic. This corrodes the lines from the inside out and the fluid loses its ability to work properly. Long story short - it's a decent tester. The only problem I have with it is that sometimes the tool won't be able to dip into the fluid because of the reservoir design. No tool is perfect all the time, and this one works just about as well as any other. Would recommend.

I found this tester brake fluid tester does a good job. I tested two of my vehicles. I found the newer did not need new brake fluid as it read at most 1% water content. My older vehicle read in the 3%~4% zone noting it needs to be changed. This tester gives me a good idea of how my brake fluid is doing.- I found it to be easy to use- I found it alto be accurate

I was skeptical about the price of this test tool but want to try it out since it got 4.5 star review.Turned out to be just a piece of junk.- My compliment to the idiot who designed the battery cover. It's extremely hard to remove it. Youneed a small flat screw driver to pry open the cover and likely will ended up damaging the upper partof the cover.- I just replaced by car brake fluid 2 months ago and want to see what's the read out from the test tool.It gave me > 4% water contents and according to the instruction, the fluid need to be replaced.- I want to test the accuracy of the measurement by opened up a brand new sealed bottle of DOT3 Prestone brake fluid and test its contents. It gave me the same result, > 4% water content. Need to replace the fluid. (see the picture)Returned. Don't waste your time on this junk.

I tested this device in three manners. 1. In a fresh can of brake fluid. 2. In my family car. 3. In my older pick up truck. Worked like a charm. I have reason to believe it is accurate.

Buen producto funciona bien y muy económico

This is a very helpful tool for verifying the moisture content of brake fluid. A good addition for diy or shops.