How many pixels a scanner can see. Most commonly, this is measured in dots per inch (dpi).For example, a typical flatbed scanner will use a scanning head with 300 sensors per inch, so it can sample 300 dots per inch (dpi) in one direction. To scan in the other direction, it will move the scanning head along the page, stopping 300 times per inch, so it can scan 300 dpi in the other direction as well. This scanner would have an optical resolution of 300 x 300 dpi. Some manufacturers stop the scanning head more frequently as it moves down the page, so their machines have resolutions of 300 x 600 dpi or 300x1200 dpi.

Indicates whether this product scans in colour.

Feature of computer scanners and multifunction printers (MFPs) that allows the automatic scanning of a sheet of paper on both sides.

Indicates the type of scanner this product is.

The colour e.g. red, blue, green, black, white.

A display which is part of the product, so you do not need to attach another display.

A sensor is a convertor than measures a physical quality (light, temperature etc.) and displays this electronically on a device.

The maximum paper size the device can handle, defined by ISO A-series.

Different sizes of paper from A0 (big) to A9 (small). A4 is the most common size used for printing documents.

The device features a socket into which a USB cable can be plugged.

Universal Serial Bus (USB) is an industry standard developed in the mid-1990s that defines the interface used for connection, communication and power supply between computers and electronic devices. Every new version - for example 1.1, 2.0, 3.0 - is much faster than the previous one.