【High-Sensitivity Gas Detection】Advanced gas sensor with approximately 16 ppm sensitivity for precise halogen gas leak detection in HVAC and automotive systems. 【Flexible Metal Probe】418mm freely bendable metal hose probe allows easy access to tight spaces and hard-to-reach areas for comprehensive leak detection. 【Triple-Color Visual Alert】Dynamic three-color backlight display (green/yellow/red) provides instant visual feedback with corresponding audio alerts for different concentration levels. 【Dual Sensitivity Modes】Adjustable sensitivity settings with high mode (16 ppm threshold) and low mode (40 ppm threshold) for versatile detection requirements. 【Fast Response Time】Rapid detection with approximately 5 seconds response time for concentrations ≤20 ppm and 2 seconds for >50 ppm concentrations. 【One-Touch Operation】Simple one-button zeroing and error reset functions ensure quick calibration and reliable performance in the field. 【Auto Power Management】Intelligent 5-minute auto-shutdown feature conserves battery life when no measurement signal is detected. Specifications: Sensor Type: High-sensitivity gas sensor Detection Range: Approximately 16-200 ppm (R134A) Sensitivity: High mode 16 ppm, Low mode 40 ppm Compatible Gases: R11, R12, R22, R123, R134a, R404A, R407C, R410A, R417A, R-1234YF Warm-up Time: Approximately 60 seconds Sampling Method: Diffusion type Response Time: ≤20 ppm: 5 seconds, >50 ppm: 2 seconds Alert System: Buzzer and three-color backlight display Operating Environment: 0-50°C / 20-80% RH Storage Environment: -10°C to 60°C / 20-80% RH Dimensions: 170 × 60 × 32 mm Probe Length: 418 mm flexible metal hose Battery: Built-in 3.7V lithium battery, 700mAh Charging: DC 5V via Type-C port