Carry out installation and maintenance work on heating systems several times a day using the flue gas analyzer with Longlife sensors. The TÜV-tested testo 300 Longlife flue gas analyzer is supplied with O₂ and CO H₂-compensated sensor up to 30,000 ppm (NO - can be retrofitted), TÜV-tested modular flue gas probe, testo Bluetooth^® printer, case and practical accessories.