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

• Comprehensive Brake Fluid Testing: Measures DOT3, DOT4, DOT5.1, ENV4, ENV6 brake fluid moisture for cars, motorcycles, trucks, and other vehicles; green, yellow, red backlight shows fluid status; adjustable green backlight for better visibility in low-light conditions
• Portable Automotive Tool Kit: Perfect for DIY car maintenance, garage inspection, roadside check, and workshop use; includes a top-mounted LED flashlight for easy operation in dark environments or tight spaces
• High Accuracy & Safety: Detection range 0%~4% with ±0.3% accuracy; corrosion-resistant metal probe ensures precise readings; pre-use inspection recommended to avoid probe damage and ensure safe testing
• User-Friendly & Energy Efficient: Data hold button locks readings for easy observation; backlight and top flashlight provide illumination; automatic shutdown conserves battery life; low voltage indicator prompts timely replacement
• Complete Packaging & Accessories: Includes 1 × brake fluid tester, 2 × 1.5V AAA batteries, 1 × cleaning cloth, 1 × instruction manual; packaged in colorful box with fabric pouch for protection and portability

The KAIWEETS Brake Fluid Tester is a high-precision automotive tool for quickly detecting moisture in brake fluid. It supports DOT3, DOT4, DOT5.1, ENV4, and ENV6 brake fluid types. Simply power on the device, select the brake fluid type, and fully immerse the metal probe into the fluid for 3 seconds to read the measurement. Green backlight indicates usable fluid, yellow signals replacement is recommended, and red signals immediate replacement is required. The tester features a data hold button to lock readings and a backlight/lighting button for visibility in low-light conditions. Automatic shutdown conserves battery life, while the low voltage indicator reminds timely replacement of 2 × AAA batteries. The corrosion-resistant metal probe ensures safety and accurate measurement. Compact and portable, the device is ideal for automotive professionals and car owners for routine brake fluid monitoring.