Updated: 17 Feb 2025

brake fluid liquid tester pens

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Updated: 17 Feb 2025

#1

Best Choice
TESMEN TBF-200 Brake Fluid Tester with 8.5-Inch Corrosion Resistance Gooseneck Probe, High-Precision Brake Fluid Tester Pen with Data Hold, 3 Colors Backlight Alarm for DOT3, DOT4, DOT5.1-Green

9.7

TESMEN

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Main highlights

Efficient Measurement and Quick Readout: TESMEN TBF-200 is equipped with a digital display and a tri-color backlight alarm system. With a measurement range of 0%-4%, it allows you to quickly draw conclusions based on the clearly displayed values

Corrosion-resistant and Clean: TESMEN TBF-200 brake fluid tester features a corrosion-resistant metal probe paired with an 8.5-inch adjustable gooseneck. This design ensures flexible operation while preventing device corrosion and maintaining cleanliness, ultimately extending the tester's lifespan

Compact and Portable for Easy Use: Weighing only 0.15lb and featuring a convenient back clip, the TESMEN TBF-200 is designed for easy portability. Its user-friendly design makes it an essential tool for ensuring your safety and peace of mind
#2

Value for Money
Aicevoos NC Brake Fluid Tester Pen Brake Fluid Test Strips, Calibrated for DOT3 DOT4 DOT-5.1 Brake Fluid

9.6

Aicevoos

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Main highlights

WIDE RANGE OF APPLICATIONS: The automotive brake fluid tester is a universal device for most vehicles. It can check the condition of DOT-3, DOT-4, DOT-5.1 brake fluids as well as most synthetic brake fluids. It is extremely easy for personal use and is widely used for private workshops, repair shops and car dealerships.

EASY TO USE: The test procedure is fast and efficient and has a simple control panel. The backlight lights green at 0%-2% data (brake fluid is ready to use). At 2%-3%, the backlight turns yellow and the buzzer sounds slowly (brake fluid needs to be changed). The backlight is red and the buzzer sounds quickly when the data is greater than 3% (brake fluid needs to be changed immediately).

EASY READING: high-sensitivity probe + audible alarm, instant display of results, large screen with three-color backlight, easy to read the measurement results whether day or night.
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#3
ITEQ Brake Fluid Liquid Tester Pen with 5 LED Indicators, Calibrated For DOT3 DOT4 Brake Fluid

9.4

ITEQ

-18%

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Why we love it

Quickly checks brake fluid quality to prevent accidents.

Easy-to-read LED indicators show water percentage clearly.

Simple and fast results in seconds, very user-friendly.

Main highlights

The LED indicators will show percentage of water in the brake fluid with 3 colors green yellow and red

Test the car brake fluid quality quickly to check whether it’s qualified, which can remind you to change the brake fluid when necessary to avoid traffic accident

Calibrated for cars using DOT4 and DOT3 brake fluids (But DOT3 is almost replaced by DOT4 because DOT4 has better performance)

-18%
#4
KAIWEETS Brake Fluid Tester Pen with Corrosion Resistance Probe, High-Precision Brake Fluid Moisture Tester with Data Hold Function, Buzzer Alarm, 3 Colors Backlight, Calibrated for DOT3, DOT4, DOT5.1

9.3

KAIWEETS

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Why we love it

Durable and corrosion-resistant design.

Quick and precise measurements.

User-friendly with convenient alerts.

Main highlights

Corrosion Resistant and Accurate
Features a corrosion-resistant probe with 0.3 accuracy for reliable brake fluid testing.

Ideal for Mechanics and DIYers
Compact, easy-to-use tester suited for both professionals and hobbyists.

Praised for Convenient Alerts
Three-color backlight and buzzer alarm enhance safety and usability.
#5
Brake Fluid Liquid Tester Pen,1PC DOT 3 DOT 4 DOT 5.1 Brake Fluid Liquid Tester Pen, Car Diagnostic Testing Tool with 5 LED Indicators, Hydraulic Fluid Liquid Oil Moisture Analyzer

9.2

YOGEIER

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Main highlights

Safe driving: This brake fluid tester comes with 5 LED indicators to show the percentage of moisture in the brake fluid. This product can quickly detect the health of the car's brake fluid, provide you with more accurate test results, and remind you to replace the brake fluid when necessary to avoid traffic accidents.

High quality: This brake fluid tester is made of nickel-plated metal probe, which is resistant to oil and oxidation and not easy to corrode. The shell is black matte plastic, better anti-slip and good body texture. The change of conductivity can be used to determine the change of moisture in the brake fluid.

Convenient and quick: This brake fluid tester is easy to use, press the button, insert the test pen, the indicator is accurate to 1%, and you can receive the result in seconds. To save electricity, the test pen will automatically turn off the power after 20 seconds each use to save power.
#6
Aicevoos NF Brake Fluid Tester Pen Brake Fluid Test Strips, Calibrated for DOT3 DOT4 DOT-5.1 Brake Fluid

9.1

Aicevoos

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Main highlights

WIDE RANGE OF APPLICATIONS: The automotive brake fluid tester is a universal device for most vehicles. It can check the condition of DOT-3, DOT-4, DOT-5.1 brake fluids as well as most synthetic brake fluids. It is extremely easy for personal use and is widely used for private workshops, repair shops and car dealerships.

EASY TO USE: The test procedure is fast and efficient and has a simple control panel. The backlight lights green at 0%-2% data (brake fluid is ready to use). At 2%-3%, the backlight turns yellow and the buzzer sounds slowly (brake fluid needs to be changed). The backlight is red and the buzzer sounds quickly when the data is greater than 3% (brake fluid needs to be changed immediately).

EASY READING: high-sensitivity probe + audible alarm, instant display of results, large screen with three-color backlight, easy to read the measurement results whether day or night.
#7
KHTD Brake Fluid Tester, Brake Fluid Liquid Testing Pen with 5 LED Lights, Auto Brake Diagnostic Testing Tool,Compatible with DOT3 DOT4 Brake Fluid

9.0

KHTD

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Main highlights

EASY TO READ:You can get results in seconds, With the percentage readings next to the LED lights on the brake fluid testing pen, you can simply read the result of water content in your brake fluid. When multiple LED lights are on, the maximum readings shall be the result of the brake fluid testing.

CONVENIENT TOOL: This brake fluid tester pen design is quite small size,easy to carry with.It's a very convenient tool to test the moisture of brake fluid for your auto brake. Easy to use ,simply press the button at the top, dip the probe the Testing the water content of the brake fluid dot 3, dot 4 etc.

BRAKE FLUID TESTING TYPE: The dot 3 brake fluid tester pen can also be used for testing the fluids of DOT4, DOT5.1, ENV6 & ENV4. Compatible with the most of automotive brake fluid,Very practical tool for brake fluid testing
#8
Brake Fluid Tester, Auto Brake Diagnostic Testing Tool, Hydraulic Fluid/Liquid/Oil Moisture Analyzer with 9 LED Indicators for DOT3/DOT4/DOT5.1 Brake Fluid(BF100)

8.8

KINGBOLEN

-10%

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Main highlights

【Support all kinds of Cars】KINGBOLEN Brake Fluid Tester can be used on all cars; It is easy-to-use and suitable for testing the water percentage in the brake fluid. Any problems please contact us to get prompt solutions. please contact us with Amazon or send mail to support@kingbolen. com .

【Support DOT3, DOT4, DOT5.1】Quick and easy method to accurately gauge the moisture content of all types of brake fluid.

【High Precision Sensor 】KINGBOLEN Brake Fluid Tester has nickel plated metal probe, which is oil-proof and oxidation-proof, with good condition and high precision.

-10%
#9
ZKTOOL New Upgraded Version Brake Fluid Tester Pen, Test DOT3 DOT4 DOT5.1 ENV6 ENV4 Brake fluids,Brake Fluid Moisture Analyzer with 5 LED Indicators,Brake Fluid Liquid Tester Pen

8.5

ZKTOOL

-20%

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Main highlights

LED lights: 5 LED lights indicate the percentage of water in the brake fluid in three colors of green, yellow, and red. From low to high, they are green (0%), green-yellow (<1%), green-yellow-yellow (1 %-2%), green yellow yellow red (2%-4%), green yellow yellow red red (>4%). Easily grasp the percentage of water in the brake fluid, and consider whether to replace the brake fluid.

Function: The new pen type brake fluid moisture tester can widely test the percentage of moisture in DOT3 DOT4 DOT5.1 ENV6 ENV4 brake fluid; the results appear within a few seconds, fast and simple. Compared with similar products, it has a faster, more accurate reading capability and a wider range. Tap the top to turn on, and the green light is inserted into the water to use, simple and fast.

Convenience: The brake fluid tester tool is simple and convenient. It only takes a few seconds to check the quality of car brake fluid. It is easy to operate for many new car owners. At the same time, it is a must-have vehicle tool because of its small size and easy portability. And it will automatically shut down if you don't use it within 12 seconds, saving your battery. (Requires 1 x AAA/1.5V battery, not included)

-20%
#10
HT662 Brake Fluid Liquid Tester Pen DOT3 DOT4 DOT5.1 Automotive Brake Fluid Content Detector Auto Vehicle Brake Diagnostic Testing Tool

8.2

Walfront

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Main highlights

TECHNICAL PARAMETERS: Detection range from 0%~4%, error is ±0.3%, detection type contain DOT3, DOT4, DOT5.1

SCRATCH RESISTANT : Using excellent material, possess impact resistance, scratch resistance, environmentally friendly

QUICK DISTINGUISH: The water content is 0%‑4% representing no water and the amount of water content in turn, so that car owners can quickly understand whether the water content of the brake fluid is qualified.

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brake fluid liquid tester pens

TESMEN TBF-200 Brake Fluid Tester with 8.5-Inch Corrosion Resistance Gooseneck Probe, High-Precision Brake Fluid Tester Pen with Data Hold, 3 Colors Backlight Alarm for DOT3, DOT4, DOT5.1-Green

9.7

Main highlights

Aicevoos NC Brake Fluid Tester Pen Brake Fluid Test Strips, Calibrated for DOT3 DOT4 DOT-5.1 Brake Fluid

9.6

Main highlights

ITEQ Brake Fluid Liquid Tester Pen with 5 LED Indicators, Calibrated For DOT3 DOT4 Brake Fluid

9.4

Why we love it

Main highlights

KAIWEETS Brake Fluid Tester Pen with Corrosion Resistance Probe, High-Precision Brake Fluid Moisture Tester with Data Hold Function, Buzzer Alarm, 3 Colors Backlight, Calibrated for DOT3, DOT4, DOT5.1

9.3

Why we love it

Main highlights

Brake Fluid Liquid Tester Pen,1PC DOT 3 DOT 4 DOT 5.1 Brake Fluid Liquid Tester Pen, Car Diagnostic Testing Tool with 5 LED Indicators, Hydraulic Fluid Liquid Oil Moisture Analyzer

9.2

Main highlights

Aicevoos NF Brake Fluid Tester Pen Brake Fluid Test Strips, Calibrated for DOT3 DOT4 DOT-5.1 Brake Fluid

9.1

Main highlights

KHTD Brake Fluid Tester, Brake Fluid Liquid Testing Pen with 5 LED Lights, Auto Brake Diagnostic Testing Tool,Compatible with DOT3 DOT4 Brake Fluid

9.0

Main highlights

Brake Fluid Tester, Auto Brake Diagnostic Testing Tool, Hydraulic Fluid/Liquid/Oil Moisture Analyzer with 9 LED Indicators for DOT3/DOT4/DOT5.1 Brake Fluid(BF100)

8.8

Main highlights

ZKTOOL New Upgraded Version Brake Fluid Tester Pen, Test DOT3 DOT4 DOT5.1 ENV6 ENV4 Brake fluids,Brake Fluid Moisture Analyzer with 5 LED Indicators,Brake Fluid Liquid Tester Pen

8.5

Main highlights

HT662 Brake Fluid Liquid Tester Pen DOT3 DOT4 DOT5.1 Automotive Brake Fluid Content Detector Auto Vehicle Brake Diagnostic Testing Tool

8.2

Main highlights

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