Halogen Gas Detector 0 To 1000PPM Sound Light Vibration Alarm Digital Air Conditioning Refrigerant Freon Leakage Tester Item Type: Halogen Gas Detector Material: ABS Detected Gas: CFCs: R11, R12, R500, R503, etc. HCFCs: R134a, R404a, R125, etc. HCFCs: R22, R123, R124, R502, etc. Range: 0-1000PPM Resolution: 1PPM Maximum Sensitivity: R12 R22 and T134A at 0.5Oz per Year (14g per year) Preheating Time (T90): 30 seconds Response Time (T90): <10 seconds Sampling Method: Diffusion type Battery: 3 x 800mAh AAA alkaline dry battery (shipped with matching battery) Running Time: >6 hours Display: LCD display, with automatic backlit lighting Direct Reading: Sensor concentration reading, battery level, concentration unit, temperature Alarm Settings: Low sensitivity alarm function, high sensitivity alarm function settings Alarm: Sound, light emitting diode, vibration indication alarm, voltage undervoltage indication Audio Prompt: The higher the beep frequency, the higher the concentration