Crystal XP2i 2nd Generation - Manual (Page 13)

Functions  11
XP2i Operation Manual
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XP2I serIaL nuMBers
serial number Location
The serial number of your XP2i is located on the stem above the pressure fitting. The serial number is also located behind the battery cover under a battery.
serial numbering system
Serial Numbers consist of 6 numbers, with the left most digit representing the year of manufacture. For example: 937834 was manufactured during 2009.
The serial number is located
both on the stem and behind
the batteries.