[John Boothby]

There are Tech-1's and Tech-1A's. They are not indicated which is which by the name on the unit. The Tech-1A is an updated -1. You can tell the difference as the -1A has what looks like phone jacks on both sides near the top. I believe these are for connecting to a printer and laptop. You will also need an ABS cartridge and a GM 88-92 Body Systems cartridge to complete your set. At least for our 90-91 cars. Nice set, though.

Just want to add that you usually don't find them this loaded with goodies like the manual.