【High Sensitivity and Adjustable】This leak detector hvac uses a U.S.-manufactured semiconductor sensor with three adjustable sensitivity levels (up to 0.14 oz./yr.) and a 16-inch flexible probe for tight spaces. 【Audible & Visual Alarms with Mute Option】When a leak is detected, the 2.8-inch TFT color screen of the refrigerant detector clearly indicates the leak concentration level, while the audible alarm beeps at an increasing frequency as the leak intensifies. Press the MUTE button to turn on/off the buzzer. 【2.8-inch TFT Color Display】Equipped with an advanced color graphic display, this R134a leak detector ensures optimal visibility and readability in both low-light conditions such as basements and brightly lit outdoor environments. 【Smart Functional Capabilities】Intelligent features including Peak Mode (captures the maximum leakage reading) and Reset Function (minimizes false alarms by recalibrating the sensor) make it a user-friendly and reliable tool for HVAC professionals. 【Durable and Oil-Resistant Construction】Designed for rugged use, the freon sniffer features an oil-resistant and impact-resistant housing, ensuring long-term reliability in demanding repair and maintenance scenarios. 【Detect All Refrigerant & Combustible Gases】The leak detector hvac detects [CFCs: R11, R12, R13, R113, R114, R115, R500, R502, R503] [HCFCs: R22, R123, R124, R141b, R142b, R401A, R401B, R402A, R402B, R408A, R409A] [HFCs: R32, R125, R134a, R143a, R152a, R404A, R407C, R410A, R410B, R417A, R422D, R427A, R438A, R448A, R449A, R452B, R453A, R507] [HFOs: R1234yf, R1234ze(E), R1233zd(E), R1336mzz(Z), R514A, R1224yd(Z), R1243zf] [Blends: R401A, R404A, R407C, R410A, R507, AZ-50 (R507), HP62 (R404A), MP39 (R401A), NU-22 (R422D)] [PFC: PFC-14, PFC-116, PFC-218, etc] [HCs(Hydrocarbon): R50, R290, R600a etc.][5%hydrogen/95% nitrogen Racer Gas] [A2, A2L, A3 refrigerants ] Propane Methane Ethane 【Professional HVAC & DIY Ready】Trusted by HVAC technicians, maintenance professionals, and DIY enthusiasts, the ALD-200 is ideal for quick leak detection on heat pumps, air conditioners, refrigeration units, and automotive A/C systems. Detects leaks with precision comparable to high-end detectors at a fraction of the cost. 【Detect Micro & Slow Leaks】Quickly locate small or slow refrigerant leaks that can be missed by dye, soap, or low-sensitivity detectors. Adjustable sensitivity up to 0.14 oz./yr. ensures reliable detection for even the hardest-to-find leaks, saving troubleshooting time and repair costs. 【Easy Setup & Accurate Calibration】Designed for ease of use: fully charge before first use, warm up the sensor, and perform auto-zero calibration in clean air. The Peak Mode and Reset Function help reduce false alarms, ensuring consistent and accurate readings every time. 【Battery & Durable Field-Ready Design】Built-in rechargeable battery supports a full day of typical HVAC service work. Rugged, oil-resistant housing protects the sensor and electronics in demanding field conditions. Lightweight and compact for easy storage in toolboxes or service vans. 1. The power indicator: real-time instructions battery allowance 2. When opening the buzzer status in green, closing status in the red 3. PEAK button instruction: indicates the PEAK function status, and the light will be on when you use this function 4. The maximum leak record: When the PEAK function is turned on, it can record the maximum leakage value you detect 5. The current leakage indicator: indicates the current leakage 6. Fault alarm: When the sensor failure, a fault indicator shows up 7. Warm-up countdown: warm-up time is 30 seconds. When the power in on it will show the warm-up process in the countdown 8. The sensitivity level: display the current sensitivity level