HP's relatively new ProBook range sits below the corporate-focused EliteBook range and is aimed primarily at small businesses. There are several models in the range and we have previously examined the large 17.3in. 4710s. The ProBook 4310s is a recent addition bringing the screen size down to 13.3in. to make a much more portable system — at least in theory. There are 14 models available, with prices ranging between £468 and £844 (ex. VAT). Our review sample, the NX571EA, costs £641 (ex VAT).