I bought this product whilst being wary ... so I took several cars with brake fluid at different stages of wear ... on the new brake fluid, the detector ranges from "no water" and less than 1% ..... on my car that rolled very little brake fluid is light color and the percentage of water is less than 1% for the moment .... c is all good ... . on the car of a friend, the brake fluid is brown / black (5 years) and then the detector is turned on while red with higher percentage in water at 4% !!!! So with these three different tests we realize that this little sensor works very well !!!! I recommend considering the price !!!!
