Take the guesswork out of brake maintenance with the GrandNations™ Digital Brake Fluid Tester Pen, a fast and accurate way to check moisture contamination in your brake fluid — suitable for use on Jeep Grand Cherokee (WK1, WK2, WJ, ZJ) and virtually any other car, truck, or SUV.

Brake fluid absorbs moisture over time, which lowers its boiling point and can lead to spongy pedal feel or reduced braking performance. This compact tester pen reads conductivity changes in the fluid and reports moisture content instantly through a simple 5-LED display, so you know at a glance whether your brake fluid is still in good shape or overdue for a change.

Vehicle Fitment

• Universal Fit — works on all cars, trucks, and SUVs
• Compatible with Jeep Grand Cherokee WK1, WK2, WJ, and ZJ

Key Features

• 5 LED indicators for clear, at-a-glance moisture readings
• Tests brake fluid by conductivity to detect water contamination
• Compact pen-style design, approx. 15cm / 5.9" long
• Instant results — no waiting, no chemical strips
• Works on any vehicle's brake fluid reservoir

Product Details

• Condition: Brand New
• Size: Approx. 15cm / 5.9"
• Power Source: 1 x 1.5V AAA battery (battery not included)

What's Included

• Digital Brake Fluid Tester Pen
  (1x tester; AAA battery not included)

How to Read the Indicator

• 0% LED: Battery is functioning normally, no replacement needed
• 1% LED: Moisture content under 1% — brake fluid in good condition
• 2% LED: Moisture content under 2% — brake fluid still safe to use
• 3% LED: Moisture content under 3% — brake fluid replacement recommended
• 4% LED: Moisture content under 4% — brake fluid should be replaced immediately

The GrandNations™ Digital Brake Fluid Tester Pen is a must-have diagnostic tool for any Jeep Grand Cherokee owner — or any driver — who wants to catch brake fluid degradation early and keep their braking system performing safely.