BTU1500 Base Kit = Analyzer w/ O₂, CO, CO₂, Efficiency, Excess Air, Draft, Pressure, Temp, Rechargeable Battery & AC Plug, 10’ Dual Hose, 12” Probe, Vinyl Case, Calibration Certificate, Operating Manual, Cheat Sheet, Water Trap, Paper Roll, 2000 Internal Data Storage, PC Software, Bluetooth™ Connectivity, Incoming Air Temperature Probe for ALL 90%+ Systems & Condensing Systems + Built-In Printer.