ITEM NAME:Car Vehicle Brake Fluid Tester DOT3 DOT4 LED Indicator Moisture Water Te PSR Descriptio n Description: Before Using This Test Pen, Please Install The Battery And Unplug The Cap On The Front End Of The Test Pen To Expose Two Metal Detection Probes. Press The Power Button Of The Test Pen. If Only The Green LED Is On But Not Flashing, It Indicates That The Meter Is Normal. If The Green LED Is Flashing, It Indicates That The Battery Needs To Be Replaced. After Turning On The Power, Fully Extend The Test Probe Of The Test Pen Into The Brake Oil Cup, And The Test Pen Will Immediately Display The Test Result Through The LED Light And Maintain The Test Result. Then You Can Watch The Test Results. The Test Results Show: Green LED (
