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A clever soul at Dell has turned the plastic spacer filling the ExpressCard slot into a small ruler, wire diameter measurement tool, and letter opener. This is maybe not an essential feature, given that the ruler is only 2in with battery such as dell Latitude D510 battery , dell Latitude D520 battery , dell Latitude D600 battery , dell Latitude D610 battery , dell 312-0068 battery , dell 6Y270 battery , dell 1X793 battery , dell C1295 battery , dell Inspiron 1100 battery , dell Inspiron 5100 battery , dell Vostro V130 battery , dell PRW6G battery long, but it shows an amusing level of design imagination. It's also worth noting that the ExpressCard slot can be specified as a SmartCard reader instead if required.