Sam4s NR-500F Series Cash RegisterThe Sam4s NR 510F has a single 57mm wide thermal till roll which can be either be used as receipt or journal while the Sam4s NR 520F has twin rolls, one for the receipt and one for a continuous printed journal. Aside from this, the two models are the same. Both models have a flat keyboard on which we can program up to 60 item product buttons with prices or simply left open so you can enter a price manually. There is also capacity for up to 1000 plu's