radioreference
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.
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.
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.
Police scanner let's you listen to police radios and NASCAR scanners are scanners that let's you listen to NASCAR team chatter
Ironically, the police department, or online on their website.
The Police Scanner 5-0 app for Android is completely free of charge and has online ratings of between 80% and 100%. This is clearly one of the best police scanners currently available. Police Scanner 5-0 can pick up most digitally broadcast police frequencies.
Cheap scanners are produced by Canon. You can purchase Canon scanners for around $50. You can purchase these scanners online from stores such as Walmart.
One can find reviews of fast scanners by going to the Amazon website. The Amazon website has fast scanners for sale as well as reviews on how effective the products are.
Modern police scanners are accurate to with about 3 mph.
For something like a police scanner your best bet is Radio Shack, either online or in store. If you are more interested in documents scanners then there are numerous places online and in person such as Staples where you can find them.
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.