Testo 327 Flue Gas Analyser, rechargeable battery and calibration protocol, Flue Gas Probe (180mm x 6mm diameter), 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, butane, kerosene oil, heavy oil, wood pellets. • Rechargable Li-ion battery. • Tightness and let-by pressure test routines included in menu(requires pressure connection adaptor). • Flow and return temperature measurement (using additional accessory probes). • Soft carry case with shoulder strap.