The peripheral devices that have been tested and approved for the GP4000 / GP3000 / LT3000 series are as follows:
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List of tested printers Last Updated : Oct. 9, 2012
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List of tested barcode readers Last Updated : Nov. 12, 2013
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List of tested modems
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List of tested models for USB memory Last Updated : Sep. 9, 2011
* Updated continually