5 LED Car Brake Fluid Oil Quality Humidity Tester Pen, Auto Diagnostic Tool

We all think that the brake fluid does not need to be changed,well this is wrong as the brake fluid absorbs humidity and it shouldbe changed when the water content reaches 3% to restore the braking power.Description :The brake fluid tester is suitable for determining brake fluid quality.Easy and quick way to test for moisture content in the brake fluidLED light indicators show percentage of water in the brake fluidDesigned without cable connectorOnly takes seconds to know the resultsCalibrated for cars using DOT 4 brake fluid (found in most cars produced since 2006)Takes 1 x AAA/1.5V battery.Suitable for DOT3 / DOT4 testingDirections for using:5 LEDs indicating the water % in the brake fluid :0% LED:Battery is OK,and there is on water content in brake fluid1% LED: Water Content, H2O=1%, brake fluid is above standard2% LED: Water Content, H2O=2%, still can use it3% LED: Water Content Water Content, H2O=3%, brake fluid should be changed4% LED: Water Content Water Content, H2O=4%, brake fluid must be changed