Dionex CD-20 Conductivity Tester CD20-1 This unit was purchased from a surplus liquidation sale. We do not know the history of it. It is in good cosmetic condition. It powers on and the screen is bright and easy to read. It goes through initialization and does not show any error messages at this time. It then reads, "ModuleWare rev. 3.00, Bios rev. 30.0". We can also change the display with the menu and keypad. We are not able to test it further. It only comes with what is shown in the pictures. E5-4 d rl fdk 81002208 8719178