This is the freehand scanning concept used in the HP CapShare 920 handheld scanner. PET imaging is best performed using a dedicated PET scanner. Horizontal resolution depended upon the quality of the scanner, transmission line, and the printer. The older type is the RS-232 barcode scanner. An amateur attempt using a flatbed scanner lacked satisfactory fidelity. It also features an under-display fingerprint scanner. It also has an In-display fingerprint scanner. Another category of document scanner is the document camera. This leads to magnetic signal variation which can be detected using an MRI scanner. A commercial time of flight laser scanner, the DeltaSphere 3000, was used. It was published after a series of meetings with various scanner manufacturers and software developers. Certain mobile apps claim to verify an Aadhaar card using a QR code scanner. Later Laurer asked Crouse for assistance in how the scanner could detect a label. The port scanner generates a SYN packet. The API presents a uniform interface to the scanner.