Brake Fluid Tester Pen With Five LED Indicators For DOT 3 DOT 4 DOT 5 1 Fluid DIY Car Diagnostic Tool For Water Content Quick Brake System Health Check And Replacement Readiness

Brake Fluid tester pen with LED indicators for DOT 3/4/5.1
✔️ 1 PCS, Black, 6.0×0.8 in, brass probe, no batteries

The brake fluid tester is a compact handheld tool used to measure water content in brake fluid. It's commonly used in auto shops and DIY settings to ensure braking performance and prevent corrosion from moisture in DOT 3, DOT 4, and DOT 5.1 fluids.

✅ Material: Brass-plated metal probe with a durable plastic housing
✅ Reading range: 0%, <1%, 2%, 3%, >4% with green/yellow/red indicators
✅ Compatibility: DOT 3/4/5.1 brake fluids; 9-15 V operation
✅ Easy operation: Unscrew reservoir cap, immerse probe, press power for 1 second
✅ Portable: 6.0×0.8 in size, about 27 g, battery not included; rinse after use

💡 What is a brake fluid tester pen used for in automotive maintenance? This handy tool helps monitor moisture in brake fluid to prevent braking issues. - Handy moisture check: quickly assesses water content in DOT 3/4/5.1 brake fluids - Helps determine replacement readiness to maintain braking performance - Compact and portable for in-vehicle checks - LED status clues provide quick, actionable guidance

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