Top 10 Picks Best Brake Fluid Moisture Testers Of 2024, Tested & Reviewed

Features :

• 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
• The LED indicators will show percentage of water in the brake fluid with 3 colors green yellow and red
• Calibrated for cars using DOT4 and DOT3 brake fluids (But DOT3 is almost replaced by DOT4 because DOT4 has better performance)
• Only takes seconds to know the results,very easy to use
• CE and RoHS approved. Protective cap included.Takes 1 x AAA/1.5V battery (not included)

Features :

• PROTECTS YOU & YOUR CAR : Check the health status of DOT3, DOT4 car brake fluid, Brake Fluid Tester Pen can be used as a digital brake fluid tester suitable for determining brake fluid quality. It will be safe for your driving1
• EATY TO USE : Press the button , Insert the tester into reservoir for one second then the tester result will be correctly indicated by LEDs.Repress the button for power off.
• 5 LEDS : 5 LED display lights the percentage of moisture content in the brake fluid, as the test results are more accurate
• USEFULL : Supports DOT3 DOT4 DOT5 brake fluid .
• EASY TO CARRY : Small size ,you can take it in pocket , take 1 AAA 1.5V battery. automatic shutdown after about 15 seconds of inactivity

Features :

• 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.
• 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.
• 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.
• Scope of application: This brake fluid tester is suitable for testing the moisture content in DOT-3, DOT-4, DOT-5.1 brake fluid. It is also very convenient for personal use and this product is widely used in personal workshops, repair shops and dealer workshops.
• Easy to carry: No cable connector design, small size, light weight, easy to carry and use. If you encounter any problem when using this product, please contact us and we will try our best to solve it for you.

Features :

• 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.
• 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.
• 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)
• Quality: The new Brake Fluid Liquid Tester Pen is a perfect tool that we updated after many studies of similar products on the market. It reads more accurately during the test. At the same time, its shell material is made of high-quality nylon, compared to ABS materials. The product is more corrosion resistant and has a longer service life.
• Operation: Long press the top button to switch the type of brake fluid, the initial default is DOT3, and each time the LED from low to high turns on three times, one brake fluid is switched. If you want to use one of the brake fluids, when the LED light is in the brake fluid type gear, please release the top button when it flashes twice, and insert the bottom sensor plug into the brake fluid (brake fluid test pen 2/3 ), and you will understand percentage of water in your vehicle’s brake fluid

Features :

• High Quality Performance: The brake fluid detector uses nickel plated metal probe, oil and oxidation resistant, not easy to corrosion. The case is matte black plastic for better skid resistance and good body texture. Metrics are accurate to 1% and results are received within seconds. Help you understand the brake fluid more clearly.
• Safe Driving: This product can quickly check the health condition of your car brake fluid and remind you to change the brake fluid when necessary to avoid traffic accidents, so that you are more comfortable and safer.
• Easy Operation: Brake fluid detector is easy to use, and small size easy to carry. Press the button, insert the test pen, it only takes a few seconds to know the result through the LED, in order to save power, this test pen has automatic shutdown function. It will automatically turn off the power after 20 seconds each time to save power.
• Wide Application Range: can be used in most cars. It is suitable for detecting the moisture content in DOT-3, DOT-4, DOT-5.1 brake fluid. It is very convenient for personal use and widely used in individual workshops, repair shops and dealer workshops.
• Service Guarantee: The brake fluid detector requires 1 LR03 AAA 1.5V battery. Our package does not include batteries, please buy batteries at local market. We offer a one-year warranty. If you cannot confirm its compatibility, or have any questions, please feel free to contact us.

Features :

• Check the car brake oil quality
• 5 LED lights display the percentage of moisture content in brake fluid
• 1 LR03 AAA batteries (not included)
• Brake fluid detection pen is based on the change in conductivity to determine the moisture change brake fluid. It shows clearly the extent of moisture contained by the light-emitting diode, high moisture content will lead to lower boiling point, affect braking performance.
• Red indicates the brake fluid needs immediate replacement, green represents good condition, yellow indicates the state is acceptable but soon replaced.

Features :

• Useful Brake Fluid Tester: Hydraulic Fluid Liquid Oil Moisture Analyzer can Check the health status of your car brake fluid quickly, And remind you to change the brake fluid in time to make you more comfortable to drive.
• Extensive Application: Brake Fluid Pen Tester Support most of the vehicle with DOT3 DOT4 car brake fluid, This brake fluid tester is developed for both professional and amateur, widely applied in individual, repair factories and dealer workshops.
• Simple Design: Brake Fluid Test have 5 LED indicators show the percentage of water in the brake fluid, quickly and accurately, The tester pen is compact and portable, with a non-slip material and nickel-plated metal probe, which is oil-proof and oxidation-proof, More wear resistant and stable than nylon materials.
• Easy Operation: Brake Fluid Liquid Tester Pen requires only Install the LR03 AAA 1.5V battery(included), press the button at the top, dip the probe into the brake fluid, and the test result will be indicated by LEDs in a few seconds,simple and fast, The test pen will automatically power off after about 15 seconds of inactivity to save power.
• NOTE: If the green LED of the Brake fluid detection pen no longer lights up after pressing the button, replace the battery, After each use, clean the test probe with tap water, This can better prevent corrosion and protect Brake Fluid Tester and save power.

Features :

• [Scope of Application] — Automotive Brake Fluid Detector is common fit for most vehicle. Check the health status of DOT-3, DOT-4, DOT-5.1 brake fluid and also most synthetic brake fluids. It’s extremly convenient for personal use and broadly applied in individual workshops, repair factories and dealer workshops.
• [Precision test and universal probe] — Highly sensitive and precise probe, can quickly and accurately detect DOT-3, DOT-4, DOT-5.1 brake fluid and has received the result in seconds. The gooseneck probe provides flexibility in detection, making the detection process more elastic and efficient.Probe top with flash light, you can observe the colour of the brake fluid if needed.
• [Easy Instant Read and Alarm] — High sensitive probe + high resolution screen + audible alarm, instant display result, large display with backlight, easy and clear reading in sun or night. NEVER LIMITED BY THE ENVIRONMENTS. As soon as brake fluid sounds too much water alarm, it will remind you that you need to change the brake fluid.
• Premium quality and ergonomic design — body with good texture, compact size, perfect hand feeling. Gooseneck surface oils and oxidation resistant, not easily corrosive. Simple control panel, easy to use. Probe top with flash light, you can observe the colour of the brake fluid if needed.

Features :

• 【High Quality Material】: Our brake fluid liquid test pen is made of nylon material, compared with ABS material, it is anti corrision. As we all know the brake oil is pretty corrosive, when you use the shell of ABS material, the plastic part of it will be corroded and dissolved by the brake oil, and the shell will be crushed after a long time using. There’s no need to worry about this problem with our product.
• 【Safe and Practical】: This auto brake diagnostic testing tool can check the health status of DOT3, DOT4, DOT5 car brake fluid. When it is time to change the brake fluid, the LED light will go from green to yellow or red, reminds you to change the brake fluid, helps you to avoid traffic accidents, provide you with a comfortable and safe driving.
• 【Easy to Read and Use】: This check engine is small in size and easy to carry. Press the button and insert it, you can see the result of water content in your brake fluid. There are 5 LEDs indicating the water content in the brake fluid : 0% means there is water content in brake fluid. 1% means H2O≤1%, brake fluid is above standard. 2% means H2O≤2%, still can use it. 3% means H2O≤3%, brake fluid should be changed. 4% means H2O≥4%, brake fluid must be changed.
• 【Multiple Usage】: This brake fluid detector is widely used in most cars, and it is suitable for detecting the moisture content in DOT3, DOT4, DOT5.1 brake fluid. This product has no cable connector, it’s convenient and easy to use. It can be used in personal cars or repair shops. There is a small suggestion, after every testing, please clean the test probe with dry cloth or paper.
• 【Note】: AAA battery required, one button operation. The battery is not included in the package. It is handy and anti corrision but please be curious not drop it on a hard surface and be careful with the battery door or the ears will snap off. In a word, with this product you can do your own annual maintenance and document it instead of change your brake fluid in case of emergency.

Features :

• Sensitive and Accurate: This detection pen uses a highly sensitive sensor to accurately detect changes in brake fluid level. Whether it is a small drop in level or an obvious lack of level, it can be accurately reflected in the status of the LED indicator light.
• Lightweight and Portable: The brake fluid test pen is small and easy to carry. You can carry it with you at any time and perform brake fluid testing when needed, making maintenance and repair easier.
• Instructions: The indicator light is green, indicating that the power supply is OK/no water. Green/yellow, the water content is less than 1%. Green/yellow/yellow, the water content is close to 2%. Green/yellow/ Yellow/red indicates the water content is close to 3%, and it is recommended to replace the brake fluid. The indicator light is green/yellow/yellow/red/red, indicating the water content is higher than 4%, and the brake fluid must be replaced immediately.
• Packaging Details: You will receive a black car brake fluid test pen. We are committed to providing you with a perfect shopping experience. If you have any usage problems, please feel free to contact us directly and we will solve the problem for you within 24 hours on working days.
• Note: If the green LED light does not light up after pressing the power button for a long time, the power supply needs to be replaced. Please wash the test probe with clean water after each use. Please do not expose brake fluid to the air for a long time because brake fluid has strong water absorption.