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ZL77A, GL77A Halogen Refrigerant Leak Detector, High Sensitivity Refrigerant Detector Suitable For HVAC Systems, Applicable For Automotive AC, Refrigerators, Cold Storage, Compatible With R134a, R410a, R22, Detection Range 0-1000PPM, 3 Seconds Fast Detection Portable 10-In-1 Air Quality Monitor, Detects AQI, PM2.5/PM10/PM0.3, CO2, CO, TVOC, Formaldehyde, Temperature And Humidity. USB Powered. Suitable For Home, Office, Car, New House And Renovation. Perfect Holiday Gift.