DIY Car Brake Fluid Tester Pen With Five LED Indicators For DOT3 And DOT4, Oil Moisture Analyzer, Auto Diagnostic Checker Tool For Quick Brake Fluid Health Check, Easy Push Button Design For Safe Driving

Brake Fluid Moisture Tester Pen with 5-LED Indicator
✔️ Single-unit tester for DOT3/4/5 with LED moisture readout

This compact, pen-style digital brake fluid tester checks moisture content in DOT3, DOT4, and DOT5 brake fluids. It's handy for DIY car maintenance and professional shops, slipping easily into a pocket for quick, on-the-spot checks.

✅ Five-LED moisture indicator shows percent water in brake fluid
✅ Supports DOT3 DOT4 DOT5 brake fluids
✅ Auto power-off after ~15 seconds of inactivity
✅ Battery powered by 1 x LR03 AAA 1.5V (not included)
✅ Pocket-sized and portable for garage work or roadside checks
✅ Clear green/yellow/red status cues for quick decisions

💡 What is a handy brake fluid tester used for?

• Checks moisture content in brake fluid to gauge boiling point risk and braking performance.
• Helps decide when to replace brake fluid to maintain pedal feel and safety.
• Compact, pocket-friendly tool suitable for DIYers and professional technicians.
• LED readout provides intuitive color cues and percent readings.