This pen-shaped brake fluid tester can easily help determine if its time for you to change your brake fluid. Staying safe and knowing that your car is in top condition is most important. Great brake fluid checking tool for your car. 1. Turn on the brake fluid tester by pressing the button. A green light should come on. If the light doesn't come on, it may be time to change a battery. 2. Unscrew the brake fluid reservoir cap and remove the brake fluid tester cap. 3. Dip the test probes into the brake fluid and the LED lights will indicate the percentage of water in the brake fluid. 4. After testing, re-tighten the brake fluid reservoir cap. 5. The tester switches off automatically after 12 seconds of inactivity. NOTE: After each test, you must clean the test head with a dry clot.
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