Feature:1. WORKING PRINCIPLE: The brake fluid liquid tester uses the change of conductivity to determine the moisture content of brake fluid, enables for DOT3 DOT4 DOT5.1 types.2. HIGH PRECISE PROBE: Equipped with a high precise probe, the brake fluid tester pen can provide accurate and reliable test results for your vehicle safety.3. WATER CONTENT DETECTION RANGE: Detects moisture content in the range of 0% to 4%, allowing car owners to quickly determine whether their brake fluid meets standards.4. SOUND AND LIGHT ALARM: With a sound and light alarm system and red, yellow, and green tricolor backlit display, the brake fluid moisture tester is easy to use and read.5. ENSURE SAFETY: The brake fluid analyzer is an essential tool to ensure your safety on the road, protecting you and your car.Specification:Item Type: Brake Fluid Liquid TesterMaterial: ABSModel: AN662Battery: 2 x 1.5 AAA batteries (not included)Display: LCDWater Content Detection Range: 0%-4%Error: 0.3%Detection Type: DOT3, DOT4, DOT5.1Usage Environment:Operating Temperature: 0-40 (32-104)Storage Temperature: -10-50 (14-122)Humidity: 95%Altitude: 2000mAlarm Mode: Sound and light alarmProbe Shape: Flat and longBacklit: Red, yellow, and green tricolor backlitWater Content Indication: The buzzing sound becomes faster, the backlit color changes from green to red, the numerical value displayed on the LCD increasesAuto Power Off: Yes (shuts off after 5 minutes of no operations)Low Battery Indication: YesSafety Level: EN61326-1.Package List:1 x Brake Fluid Liquid Tester1 x User Manual