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The Gunson Brake Fluid Tester is a simple but effective way of testing the brake fluid in a vehicle and showing its result with a coloured response. A green light indicates the brake fluid is ok and has a water content of 1.5% or less, whilst a red light indicates a water content of at least 3% and should be changed asap. The tester features an automatic shut off when not in use to save battery life.
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