1. Gas leak detector Features switch on reset and automatic tracking, capable of ignoring ambient halogen gas concentration, refrigerant leak detector for HVAC. 2. Sensitivity adjustment: This product offers continuous sensitivity adjustment, allowing real time tuning during detection, refrigerant AC and HVAC tools. 3. Refrigerant leak detector Sensitivity can be adjusted anytime, with automatic adjustment to detection mode, halogen tester. 4. Auto following circuit: When the instrument is in detection mode, the automatic circuit tracks environmental halogen and adjusts to changes in element gas concentration to prevent false alarms, HVAC tester, HVAC leak detector. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store