Tester determines quality of brake fluid.
- One battery included: 1.5V AAA.
- Remove cap from brake fluid reservoir.
- Remove probe cap from brake fluid tester.
- Press power button on top of tester. Green LED lights up.
- Dip entire length of metal probes into brake fluid.
- After one second, match color of LEDs with color chart to determine brake fluid quality. Tester automatically powers off after twelve seconds of inactivity.
OTC 4598 Brake Fluid Tester 
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