Alcoscan AL5500 is a very easy to use, reliable and re-usable hand held personal breathalyser. It uses microcomputer control with a 3 digit LCD display and audio cues. The last test result and cumulative test count will be displayed when you hold the power switch down before performing a test. The unit requires mouthpieces or drinking straws for correct operation. This unit is suitable for personal use and not to test employees.