Honeywell HAFUHT0020L4AXT Honeywell Zephyr™ Digital Airflow Sensors: HAF Series-High Accuracy, Unidirectional Flow, G 3/8 Female Threaded Fitting per ISO 1179, 0 SLPM to 20 SLPM Flow Range, Digital I²C Address: 0x49, 3 Vdc to 10 Vdc Supply Voltage