The MicroLab 402 is a legacy product, released in 2002 and replaced by the FS-522 in 2006. These units use RS-232 communication, and have a ten-wavelength spectrophotometer. 402’s are still running in several universities. Software version 5.1.1 is the latest software version that will operate the 402.
MicroLab 402’s can be operated from Windows 7/10 computers with USB communication. A StarTech USB to RS232-DB9 Serial Adapter Cable – ICUSB232V2, CDW # 3203815, is available from CDW, (800) 808-4239, for about $16.