General red scanner can scan far? If a red light is very coarse, it is infrared, and if it is of a very thin, that is the laser, there is a method: IR gun on the gun need to scan the bar code above, is the need to close the scan , not far from the sweep, the general control within 3CM of the distance from the laser scanner is relatively far away, usually within 20CM capital can be scanned on a scanner with a red laser scanner differences: First, the general precision The scanner is red. Secondly, the laser gun is used to rotate the prism to make the point the laser light into linearly, so life is limited, because the prism rotation for a long time certainly wear. advantages of laser scanning depth of field guns that long, speed fast, but good red gun can do, but the price more expensive than laser gun. 1 first. a. If the bar code density is less than 5mils, generally only use high-density barcode scanner b according to the situation you need to scan. If you scan a two-dimensional bar code, then to select a two-dimensional scanner c. If you want more than one meter from the bar code scanning, with a long depth of field of the scanner to choose d. For if you need to edit scanned data, such as scan data only take the first seven you need to select the brand scanner, ordinary scanner does not support this feature. scanner according to your use of the environment and if the harsh environment, it is recommended to use industrial-type bar code scanner, if it is an office environment, you can use an ordinary scanner. selection of laser or red light, the key to how you want to scan a bar code quality samples, such as: barcode data bits, bar code clarity, as well as bar code readers and other pre-production capabilities are standard red laser scanner is much weaker than that. Scan depth of field is also near a lot better than laser, but generally have a red light to be much cheaper than laser. scanner according to the range you want to use, if a mobile scanner range of more than three meters, it is recommended to use wireless scanning guns, choose from 10 meters transmission distance -100 meters of various wireless scanning gun 5 scanner interface. was then an ordinary USB port, keyboard port, serial port, or take some special equipment mouth?