Airflow Transducer (High Flow Pneumotach) - TSD107B Airflow Transducer (Medium Flow Pneumotach) - TSD117 Airflow Transducer (Low Flow Pneumotach) - TSD127 Airflow Transducer (Very Low Flow) ±12 mL/sec - TSD137A Airflow Transducer (Very Low Flow) ±20 mL/sec - TSD137B Airflow Transducer (Low Flow) ±60 mL/sec - TSD137C Airflow Transducer (Low Flow) ±150 mL/sec - TSD137D Airflow Transducer (Medium Flow) ±350 mL/sec - TSD137E Airflow Transducer (Medium Flow) ±1200 mL/sec - TSD137F Airflow Transducer (Medium Flow) ±3000 mL/sec - TSD137G Airflow Transducer (High Flow) ±8000 mL/sec - TSD137H Airflow Transducer Replacement Heads