The 300A PacScan offers a portable, digital A-scan, with easy-to-use touch screen operation, extreme accuracy, repeatable measurements and reliability. The combination of a high frequency, low noise probe and fast precise algorithms enables scan capture immediately upon application of the probe along the visual axis. Built-in immersion capabilities and up to eight IOL formulas, including two post-refractive formulas. Axial length, ACD, and lens thickness are provided for each scan. Group up to five scans with average axial length and standard deviation automatically calculated. Easily review each scan, delete outlying scans, and add new scans, as desired. Customizable tissue velocities of each structure and highly-developed automatic scan recognition algorithms ensure accurate and repeatable measures. Built-in calibration check ensures continued accuracy of system. Touch screen operation with large backlit display Complete measurement and calculation record within seconds Ability to store up to five different user profiles Portable and compact weighing less than 6 pounds (3 kg) Fully adjustable tilt for ergonomic comfort Optional printer