PlanOn’s Printstik PS910 is a niche product, but it does a pretty good job of printing simple spreadsheets, emails, invoices and suchlike. The ability to print wirelessly from Bluetooth-enabled devices as well as from a standard USB 2.0 connection is useful, as is battery power option. However, pages curl up the way thermal-printed credit-card receipts do, running costs are higher than most laser printers and inkjets, and you have to use the special thermal paper. PlanOn has also done a great job of making the printer easy to use.

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