Testo 327 Flue Gas Analyser, rechargeable battery and calibration protocol, Flue Gas Probe (180mm x 6mm diameter), Pressure hose connection kit, Differential temperature kit (2 x pipe clamp probes), testo infrared printer, soft carry case with shoulder strap, AC power supply.The testo 327-1 Flue Gas Analyser offers a robust and simple entry into flue gas analysis for domestic boilers. It measures O2 & CO , and will calculate ratio, CO2, etc. The 4-line LED display can be configured to the users requirements, and its back-lighting function guarantees an easy-to-read display even if lighting conditions are unfavourable. The analyser stands out on account of its easy menu navigation and ergonomic housing as well as its durability.• 4,000ppm CO sensor with automatic pump shut off to help prevent saturation • Fuels selectable include natural gas, propane, btane, kerosene oil, heavy oil, wood pellets • Rechargable Li-ion battery • Tightness and let-by pressure test routines included in menu ( pressure connection adaptor included) • Flow and return temperature measurement (2 x pipe clamp accessory probes included) • Soft carry case with shoulder strap