Skip to main contentSkip to footer
Slide 1 of 10

Overview

Check your brake fluid in seconds. This pocket sized tester pen measures water content in DOT3 and DOT4 brake fluid and shows the result on 5 LED lights in green, yellow and red, so you know when it is time for a fluid change. Simple one button use, protective cap included, CE and RoHS approved. Runs on one AAA battery, not included.

New 2026/27 Edition — Brake Fluid Tester Pen with 5 LED Indicators for DOT3 and DOT4 Fluid Water Content Checker Quick Car Brake Safety Test Tool with Protective Cap

Model: BFTST-505
Web Code: 20251202
Sold and shipped by | 4.5 seller rating (348 reviews)

Sale ends: *

Available for deliveryAvailable online only

Delivery times vary by location. Most Marketplace items leave sellers' locations within 2 business days. Allow additional time for shipping.

Enjoy on orders from this seller.

Seller Return Policy

Read return policy

Warranty Information

Check with the manufacturer for details.

For Quebec residents: See the Availability Guarantee disclosure in the Specifications section below.

• 5 LED Indicators: Five LED lights show the water level in your brake fluid at a glance.

• Colour Coded Results: Green, yellow and red lights make results easy to understand.

• DOT3 and DOT4: Calibrated for DOT3 and DOT4 brake fluids used in most vehicles.

• Results in Seconds: Dip the tip and get a reading in just a few seconds.

• Safety Reminder: Tells you when to change brake fluid to keep braking safe.

• Easy to Use: Simple one button operation for drivers of any skill level.

• Pocket Size: Compact 15 cm pen fits in a glovebox or tool bag.

• Protective Cap: Included cap protects the probe tips between tests.

• Certified: CE and RoHS approved, powered by one AAA battery not included.

For Quebec residents – Disclosure under the Consumer Protection Act

In compliance with Bill 29, Best Buy and third-party sellers on Best Buy Marketplace do not guarantee the availability of replacement parts, repair services, or maintenance information for any products. Coverage provided through any Best Buy Protection programs and applicable manufacturer warranties, if any, remain in place. Please contact the manufacturer directly for information about their availability guarantee.

Shipping Charges

Free standard shipping on all orders.

Processing Time

Most items ship within 2 business days after an order is placed*. Allow additional time for shipping to your address.
*Please note: If an item you ordered becomes unavailable, you'll be notified and a full refund will be processed within 2 business days.

Shipping Area Restrictions

Shipping is not available in the following areas*:
  • No restrictions in Canada
*Please note: Shipping area restrictions may vary for large items. If an item can't be shipped to your address, we'll let you know during the checkout process.
See our return policy to find specific return information for this product and steps on how to return by mail.