Brake Fluid Tester with 5 LED Indicator Brake Liquid Testing Pen Automotive Brake Diagnostic Testing Tool Calibrated For DOT4

It was exactly as advertised. I have no way of knowing it’s accuracy so I can not comment on that issue. I do know I had no way of knowing the brake fluids’ moisture content but this seems to work well with regard to that. I tested brake fluid straight from the container then from my master cylinder and there was a difference. I would definitely recommend this product.

While a hydroscope would give a better result, this is far less expensive. My only Recommendations are:1) if any reading is other than 0% suck the fluid out of the Reservoir, Each percentage point lowers the boiling point of DOT 3 By 34 Degrees F. Which can cause Hydraulic Failure due to Hot Brakes.2) Always make sure to do this before servicing your brakes, or every 2 years which ever occurs first.

From the seller along the way to meSome how the included battery was missingHave not use to review

look for battery compartment on the side. Tried it of one car - showed excessive water in brake fluid. going to test it on a new can of fluid just to be sure.

Product description says tester is for DOT3 or DOT4, but the package only says DOT4. I just tried it with a new unopened bottle of DOT3 and it says there is 3% moisture content, so apparently it doesn't work with DOT3.

There was a problem with the first tester I ordered but, after the seller found out, they sent me a new one the same day and it works much better.

Works good for the price. battery cover falls off. had to fix it before I could use it. Got two of them and bothe battery covers would not stay on.

Received the item promptly. Used it one time so far to test the brake fluid on my motorcycle. Worked great, very easy to use, just put a battery in, put the probes in the reservoir and test so simple. Price is awesome as well.