Don't go with any card reader, but a high quality high speed aluminum USB reader that supports micro SD card formats. This discrete portable Micro SD card reader supports Micro SD and Micro SDHC.
Memory card reader supports Micro SD/Micro SDHC
Works with every flavor of GNU/Linux: No proprietary components
Support for all popular and libre (free) distributions
Size: 1.12 x .73 x .33 inches (28.6 x 18.7 x 8.4 mm)