Sensirion 3.000.168 SFM3100-MHN CMOSens Gas Flow Sensor FW V1.0 Customer Part #161657. For Hamilton part #161657. Factory bulk packaging shown for reference only, sensor will be repackaged for individual shipments. At the onset of this listing we have over 5000 of these units available. Considerable discounts will be given for large quantity purchases at reasonable discounted rates. Shipping methods may be changed to agreeable methods on large quantity shipments.