Getting the Right Fingerprint Scanner

Choosing the right fingerprint scanner might seem like a difficult task, but there are only a few key considerations to make to find the right one for your needs. Read on to find out more and check out the many affordable fingerprint scanners that are available on eBay. 

How do you know if a fingerprint scanner is accurate? 

Accuracy is essential because you don't want unverified people to be granted access. There are several factors and measurements used to determine accuracy. Some of the most common factors are:  

  • Resolution:This is usually measured in dots per inch (DPI). A higher DPI means a clearer, more detailed image. Choose a sensor with a DPI of 250 or higher to ensure it properly scans each fingerprint.
  • False acceptance rate:Also known as FAR, this is a measurement of how many times an unverified person was granted access. This will show you how many scans it requires for an unverified person to fool the system.
  • False reject rate:Also known as FRR, this is the opposite of FAR. This is a measurement of how often a verified person was denied access.

What factors affect installation of a sensor? 

The sensor needs to work with your computer for it to function properly. Check the connection method first. Many sensors have a USB wire, but others may require different connection methods. You'll also want to see what type of operating systems the sensor is compatible with. Since this hardware stores fingerprints in a database, you may also need certain software with the sensor. The software will usually come with the sensor, but not always. Check the eBay item description for this information. 

What are the different types of fingerprint scanners? 

There are several methods used to scan fingerprints. Each one is accurate, so the major consideration is size and price when looking through the new and pre-owned fingerprint scanners on eBay. You should also check to see if the scanner works with your software and hardware. The common types are:  

  • Optical:A bright light shines from the device and it reads the finger. The resulting image is then turned into code and sent back to see if it matches a fingerprint already in the database.
  • Capacitive:This measures the tiny electrical changes that occur when you touch the sensor. The ridges and whorls of your finger will make a charge, while the hollow portions of your finger will not.
  • Ultrasonic:This bounces ultrasonic waves off your fingerprint to create a 3D map of the image. Ridges, whorls, and hollow spots will all read differently to the ultrasonic waves, ensuring that the reading is accurate.