With this kit, you will be equipped for the most important measurements involving domestic heating systems: the testo 300 flue gas analyzer is supplied with O2 and CO sensor up to 4,000 ppm, basic flue gas probe, testo Bluetooth® Connector, 1x testo 510i bluetooth differential manometer, 2 x testo 115i bluetooth pipe clamp thermometer, instrument carry case, AC USB power supply.