The ASFST serial number is next to the CE mark and underneath
the barcode at the bottom of the instrument case.  Newer versions
of the rubberized grip have a cut-out so you can see the serial


For older versions of the rubberized grip, you will
need to remove the grip to see the serial number
of the instrument.


NOTE:  There is another white sticker on the other side of the device - this "F Number" is an Intoximeters internal designation and is NOT a serial number.