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Order Gryphon M100 if you need only read normal 1D barcodes; Code 39, Code 128, EAN-13, Interleaved 2 of 5, etc.
Order Gryphon M200 if you need to scan 2D barcodes, or multi-row barcodes, like; PDF417, DataMatrix, etc.
GRYRF-04 and GRYRF-06 include one base station and one reader (i.e. everything you need).
You can only order GRYRF-01 or GRYRF-02 if you already have a base station that you want to use the reader with.