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This simple and effective tester OTB 601A shows the condition of brake fluid with a coloured response. Green indicates brake fluid is 1.5% water and Ok, whilst red indicates 3% water and fails the test. It has an automatic shut off to preserve the battery when not in use.
1 X AAA Battery included

Instruction:

• LED red: change brake fluid
• LED red flashing: change battery
• LED yellow: low percentage of water, check again within 6 month
• LED green: brake fluid OK/ battery OK
• Use 3A batter (included)
• Remember to dry this tester before using in brake fluid
• This convenient brake fluid tester is designed without cable connector.
• Use 3A battery(included in this slide card), this tester allow you work distant limit free and don't need to worry about your swirly line.
• Check oil fluid concentration precisely
• Tester has auto-off function