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

working well. so, easy to use, not a bad price either.

Simple to use with easy to read display. Just power on, dip the electrodes and get results. Works great plus this model was among the lowest price brake fluid testers.

The KAIWEETS Brake Fluid Tester Pen is a fantastic tool for anyone who wants to stay on top of their vehicle maintenance. I was impressed by how simple it is to use—just dip the probe into the brake fluid, press a button, and get an instant, clear reading with the LED indicators.It’s compact and feels solid in hand, with a professional design that’s easy to store in the glove box or toolbox. The readings are consistent and accurate, and it gave me the confidence to know when it was time to replace the fluid in my car.For the price, it’s a no-brainer. Great tool for DIYers and even pro mechanics. Highly recommend!

The old days were changing the brake fluid after xxxxx mileage or when it looked dirty, not a great way to have reliable brake system. This little tool allows for instantaneous reading of moisture in the fluid reservoir. It has three zones that are lit up in corresponding colors, red, yellow, green making it easy to use and read the LCD display, it’s accurate against new vs old fluid as expected but you’d need a lab to analyze the water content for true accuracy. It’s compact size it about the same as your average cigar. Functions as designed and looks to be durable in construction. Another specialty tool that makes your automotive life easier in my opinion. Great value for the money.

It is great and accurate

This worked well for the three cars and a can of fresh brake fluid I tested. The test results were aligned with what I expected:- Can with fresh brake fluid measured 0.2%- Car with recent brake fluid flush measured 1.1%- One-year-old car measured 1.3%- Four-year-old car (with no brake service yet performed) measured 1.7%The probe can be switched between DOT 3 and DOT 4 fluid (not sure how the measurement changes). Instructions are brief but clear with an explanation of the various humidity levels and follow-up action (0-2% all OK, 2-3% plan for brake fluid replacement, 3%+ replace brake fluid immediately). The three ranges are accompanied by a different color backlight (green, yellow, red) and buzzer sounds.The probe feels solid and durable. Overall seems to be a useful tool to determine when brake fluid replacements are needed.

Works as it should. Saves on maintenance by changing when needed.

I recently purchased the Kaiweets Brake Fluid Tester Pen for my shop, and it’s been a fantastic addition to my toolkit. As a mechanic, it’s essential to ensure brake fluid is safe and effective, and this tester makes the process quick and easy.The tester provides clear, precise readings of brake fluid moisture levels, with a simple 3-color backlight system that indicates whether the fluid is safe or needs to be replaced. The data hold function is a great feature, allowing me to easily show the customer the exact reading. It’s also calibrated for DOT3, DOT4, and DOT5.1 fluids, which is perfect for the variety of vehicles I work on.The corrosion-resistant probe is durable, and I love the buzzer alarm that alerts me when the moisture level exceeds safe limits. This tool has saved me time, increased accuracy, and improved the quality of service I provide to my customers. Highly recommend it for any mechanic looking for a reliable brake fluid tester