With the Testo 0554 3004 Bluetooth Connector, you can perform up to four additional wireless measurements in parallel to your exhaust gas measurement with the Testo 300. After switching on the individual Smart Probes, they automatically connect to your flue gas analyzer. All parallel measurements are also automatically displayed on your Testo 300 and can be started and stopped simultaneously. Via the connection to the Smart App, the measurement, documentation and data transfer of all parallel measurements is carried out in a flash.