Brake Fluid Test Pen 5 LED IndicatorLights Display, The Test Results Are More Accurate.Name: Brake oil quality test penProduct voltage: 1.5VScope of application: 0-50CScope of application: all modelsProduct certification: CE certificationtechnical parameter;green:(The battery is OK, that is, the brake fluid does not contain water)green/yellow:(The water content in the brake fluid is less than 1%, the brake fluid has good performance and can be used with confidenceGreen/Yellow/Yellow:(The water content in the brake fluid is about 2%, and the brake fluid can continue to be usedgreen/yellow/yellow/red;(The brake oil contains water, it is recommended to replace the car oilGreen/Yellow/Yellow/Red/Red:(Brake, the brake fluid must be changed immediately, otherwise it is very dangerous)