Brand: FORENSICS DETECTORSModel: FD-4S-FLUEUser Manual: Click HereBlog Article: Click Here Features: ⚛️ RESIDENTIAL: For residential combustion analysis & ambient air quality, probe, or continuous sampling in confined spaces. 🌇 FEATURES: Color screen, graphing, and alarm logging. Includes case, water trap, particle filter, and NOx filter to reduce cross-sensitivity errors. 🔬 SENSORS: High-quality CO and O2 sensors. Calculates COAF (CO air free) and excess air (EA) for combustion analysis. Detection error better than ≤ ± 5% F.S. and response time: < 60 sec. 💪 STRONG: Robust design with ABS and anti-slip grip rubber. Comes with a strong magnet for appliance mounting. 🕵️ TRUSTWORTHY: 1-year limited warranty. Arrives with a signed and dated calibration certificate. Details: A professional residential combustion analyzer + handheld pump with O2 & CO sensors. 32-bit microprocessor, color screen, real-time graphing, and alarm logging. Ideal for HVAC professionals, contractors, or maintenance engineers for residential boilers, heaters, and furnaces. The display screen shows CO, O2, COAF (CO air-free), and EA (Excess Air). The detector can also be used as (1) an ambient detector for general air quality measurements (2) a spot detector or (3) a combustion and flue gas analyzer. Please note, that this analyzer does NOT detect flue temperature or calculate combustion efficiency and does not detect nor calculate carbon dioxide (CO2). In addition, also note that this unit is not made for automotive exhaust gases since the CO in automotive combustion engines typically exceeds 1000ppm CO and may blow out the CO sensor. For automotive exhaust applications, please see the auto exhaust gas analyzer. Included: Aluminum case, analyzer containing CO and O2 sensors, niobium magnet for mounting on appliances, electronic pump, stainless probe, hose assembly, 3 feet of high temp silicone tubing, water trap, NOx filter, sensor cap, screw to mount sensor cap to the analyzer, USB charging cable, USB charger, certified calibration certificate, and a user manual. Calibration Options: Calibration Service by Forensics DetectorsCalibration Tutorial (DIY) Calibration Kit (DIY sold separately): Calibration Gas (Combustion Gas)Calibration Gas Regulator (C10)Tubing Bump Gas (sold separately):Bump Gas (CO)Bump Gas (N2)Accessories and Parts (sold separately):Gas Sensor Replacement (CO) Gas Sensor Replacement (O2) Gas Detector Waterproof CaseGas Detector Stand Analyzer Specifications Gas Sensor Type: Electrochemical Gas SensorOxygen (O2) Detection: 0 - 30% with 0.1% resolution Carbon Monoxide (CO) Detection: 0 - 999 ppm with 1 ppm resolutionComes Factory-CalibratedError: ≤ ± 5% F.S.Response Time: ≤ 60 sec Store / Operating Temp: 0°F - 122°FStore / Operating Humidity: