Police scanners check for police radar beams so that a person knows whether or not they are being monitored. A computer scanners scans a physical document and makes it into a computer document.
One can find police scanners when one goes to a store called Scanner Master. This store carries police scanners made by Uniden and Bearcat. Price varies by brand and model.
The best place online to listen to online police scanners is onlinepolicescanners.org. Listening to the police scanner online should not damage your other scanners.
There are 3 types of scanners currently being sold on the market. These scanners are photo scanners, paper fed scanners, and hand held scanners.
Police scanner let's you listen to police radios and NASCAR scanners are scanners that let's you listen to NASCAR team chatter
radioreference
Specialty hobby and electronics stores such as Radio Shack carry police scanners. Additionally one can buy police scanners online from ScannerMaster and Walmart. There are a number of apps for smartphones that also act as police scanners and many local jurisdictions are now broadcasting their emergency channels over the internet as well.
Modern police scanners are accurate to with about 3 mph.
Police scanners are radios that monitor the police channels on the police radio. You can hear the officers being dispatched to calls and hear them talking back and forth. Be aware, however, that since 9/11 most big-city police radio channels are now encrypted and cannot be monitored.
There are various ways in which computer scanners have evolved over the years. For example, they have gotten more compact.
Almost any computer hardware store will sell portable scanners. They are easy to find, and there are usually many different brands at most price ranges. Good places to start are PCWorld or Currys.
No, some scanners need a different driver.
Anywhere, and by anyone, who wants to scan an image into a computer. =D