Brake Fluid Tester Automotive Oil Moisture Water Detection For DOT3 DOT4 DOT5.1

Step 3: Press the SELECT button to automatically place DOT3. The brake fluid tester is used to check the health of DOT-3, DOT-4, DOT-5.1 brake fluids and most synthetic brake fluids. Step 1: Install a 9V battery (6F22) on the back of the brake fluid tester.

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