Brake Fluid Tester Pen With 5 LED Indicators, Car Brake Diagnostic Tool For DOT3 DOT4 DOT5.1, Auto Hydraulic Fluid Checker And Oil Analyzer For Water Content, Quick At A Glance Brake Fluid Health Check

Single Brake Fluid Health Tester Pen with 5-LED indicators
✔️ 1-piece unit for quick, at-a-glance brake fluid checks

This compact brake fluid tester pen measures water content in brake fluid using electrical conductivity. It's ideal for cars, trucks, and SUVs in home garages, repair shops, and service bays. Size: 6.0×0.8 inches (152.4×20.3 mm). It operates on 9-15 V and supports DOT-3, DOT-4, and DOT-5.1 fluids.

✅ 5-LED color-coded indicators map water content to 0%-4% and above
✅ Brass-plated probe provides strong conductivity and corrosion resistance
✅ Compatible with DOT-3, DOT-4, DOT-5.1 brake fluids in 9-15 V systems
✅ Easy operation: unscrew reservoir cap, dip probe, press button for 1 second
✅ Pocket clip for handy access in garages and service bays
✅ Requires AAA battery (not included) and probe rinse after use

💡 What is a brake fluid tester pen used for and how does it work?

This handy tool uses electrical conductivity to gauge water content in brake fluid, signaling when a replacement is due. - It measures water content quickly and provides LED color codes - Works with DOT-3, DOT-4, DOT-5.1 fluids and 9-15 V systems - Portable with a pocket clip for handy access - Battery required: AAA (not included)✝️