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ThereB-Qtech B-Qtech Air Quality Monitor 5 in 1, TVOC HCHO Temperature Humidity CO2 Meter,Rechargeable Air Pollution Analyzer, CO2 De 【5 In 1 Multi Function】 The air quality monitor can detect the carbon dioxide, temperature, humidity, HCHO, TVOC at theB-Qtech B-Qtech Air Quality Monitor 5 in 1, TVOC HCHO Temperature Humidity CO2 Meter,Rechargeable Air Pollution Analyzer, CO2 De 【5 In 1 Multi Function】 The air quality monitor can detect the carbon dioxide, temperature, humidity, HCHO, TVOC at theChina Petrochemical Press Combustible gas detector alarm field test gas detection alarm field calibration test series pocketbook(Chinese Edition) OUFKAR OUFKAR Refrigerant Leak Detector, 0.1 oz/yr Freon Leak Detector R134A R410A R22 SF6 HVAC Leak Detector Halogen Gas Teste 1. 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