---
product_id: 655029440
title: "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"
brand: "kaiweets"
price: "¥5799"
currency: JPY
in_stock: true
reviews_count: 8
category: "Kaiweets"
url: https://www.desertcart.jp/products/655029440-kaiweets-brake-fluid-tester-pen-with-corrosion-resistance-probe-high
store_origin: JP
region: Japan
---

# 3-color backlight + buzzer alert Compact, battery-powered (2x AAA) ±0.3% precision accuracy 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

**Brand:** kaiweets
**Price:** ¥5799
**Availability:** ✅ In Stock

## Summary

> 🚗 Stay ahead of brake failure—test smarter, drive safer!

## Quick Answers

- **What is this?** 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 by kaiweets
- **How much does it cost?** ¥5799 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/655029440-kaiweets-brake-fluid-tester-pen-with-corrosion-resistance-probe-high)

## Best For

- kaiweets enthusiasts

## Why This Product

- Trusted kaiweets brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Last:** Corrosion-resistant probe and durable polypropylene body for reliable, long-term use.
- • **Instant Alerts:** 3-color backlight and buzzer alarm warn you immediately when brake fluid moisture exceeds safe limits.
- • **User-Friendly Design:** Compact, portable pen-style tester with data hold function for easy reading and storage.
- • **Precision You Can Trust:** High-accuracy moisture detection within ±0.3% ensures your brakes perform at their peak.
- • **All-in-One Compatibility:** Calibrated for DOT3, DOT4, and DOT5.1 brake fluids, covering all your vehicle’s needs.

## Overview

The KAIWEETS Brake Fluid Tester Pen offers professional-grade precision with ±0.3% accuracy and a corrosion-resistant probe, ensuring fast, reliable moisture readings for DOT3, DOT4, and DOT5.1 fluids. Featuring a 3-color backlight and buzzer alarm, it instantly alerts you when fluid quality drops below safety standards. Compact and battery-powered, it’s designed for both mechanics and DIY enthusiasts who demand durability, convenience, and peace of mind on every drive.

## Description

Buy 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: Brake Fluid Level - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Handy - This is a quality tool that’s easy to use and works well.
Review: Works for ME! - Well made, accuracy fair but adequate for my needs. Wish it had a swivel for those cars with awkward openings. Still feel it was worth the purchase.

## Features

- Durable and Corrosion-Resistant : Featuring a corrosion-resistant probe, this brake fluid tester is designed for long-lasting performance. The durable construction ensures that the tool remains effective over time, even with frequent use, making it a reliable addition to your maintenance toolkit
- Fast and Accurate Measurements : This brake system sensor ensures quick and precise readings with an accuracy of ± 0.3%, covering a range of 0% - 4%. Whether you're checking DOT3, DOT4, or DOT5.1 fluids, this device offers reliable results, helping you easily maintain optimal brake performance
- Convenient Features : The brake fluid level sensor includes a data hold function, allowing you to capture and review readings easily. It also features a three-color backlight and buzzer alarm function, which will sound an alarm to remind you to change the brake fluid immediately when the humidity level exceeds the safety limit of 3%, providing additional convenience and safety
- Convenient Power and Operation : With its compact design, this brake fluid tester is easy to carry and store. It operates on 2x1.5V AAA batteries and functions well within a temperature range of 0-40°C. Its user-friendly design and quick measurement capabilities make it an essential tool for both professional mechanics and DIY enthusiasts
- Customer Service : KAIWEETS Provides a 30-day free return and a 3-year warranty for each product. Lifetime technical support, if you have any questions, please feel free to contact us. Enjoy faster and more efficient measurements with this brake fluid tester. Allowing you to promptly address any issues and ensure your vehicle’s braking system is always in top condition

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0D9M279V9 |
| Batteries | 2 AAA batteries required. (included) |
| Best Sellers Rank | #4,809 in Automotive ( See Top 100 in Automotive ) #1 in Automotive Replacement Brake Fluid Level Sensors |
| Brand | KAIWEETS |
| Date First Available | July 17, 2024 |
| Item Weight | 4.2 ounces |
| Item dimensions L x W x H | 9.92 x 2.56 x 1.57 inches |
| Item model number | KVBF01 |
| Lower Temperature Rating | 32 Degrees Fahrenheit |
| Manufacturer | KAIWEETS |
| Material | Polypropylene |
| Measurement Accuracy | ±0.3% |
| Measuring Range | 0% - 4% |
| Output Type | Analog |
| Product Dimensions | 9.92 x 2.56 x 1.57 inches |
| Upper Temperature Rating | 40 Degrees Celsius |

## Product Details

- **Brand:** KAIWEETS
- **Item dimensions L x W x H:** 9.92 x 2.56 x 1.57 inches
- **Lower Temperature Rating:** 32 Degrees Fahrenheit
- **Material:** Polypropylene
- **Measurement Accuracy:** ±0.3%

## Images

![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 - Image 1](https://m.media-amazon.com/images/I/71cQgnW2REL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Handy
*by M***B on January 4, 2026*

This is a quality tool that’s easy to use and works well.

### ⭐⭐⭐⭐⭐ Works for ME!
*by J***S on October 6, 2025*

Well made, accuracy fair but adequate for my needs. Wish it had a swivel for those cars with awkward openings. Still feel it was worth the purchase.

### ⭐⭐⭐⭐⭐ Awesome Item
*by O***O on December 25, 2025*

Before goes to the car dealership check your fluid brake with this tester, easy to use and very precise. I took my Mazda 22,000 miles they told me I have to flush the brake fluid because it was contaminated I knew they were lying, so I use the tester and the brake fluid fine.

## Frequently Bought Together

- 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
- Phoenix Systems 8006-B Double-Ended Brake Fluid + Coolant Test Strips (15 foil wrapped test strips), 1 Pack
- ITEQ Brake Fluid Liquid Tester Pen with 5 LED Indicators, Calibrated For DOT3 DOT4 Brake Fluid

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.jp/products/655029440-kaiweets-brake-fluid-tester-pen-with-corrosion-resistance-probe-high](https://www.desertcart.jp/products/655029440-kaiweets-brake-fluid-tester-pen-with-corrosion-resistance-probe-high)

---

*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-01-27*