The Opel Tech2 reader, this is an ODB2 reader specially made for GM Opels but some American GM cars, Saab, and even some Suzuki’s also used them.
I already owned a Tech2 reader, a China clone version. But i’ve managed to buy a real Opel version from my Old Opel specialist which was also my old neighbour and friend. I also bought his Tech1 back in the day from him.
Also i bought a whole heap of other tools from him that day. Battery tester, old vintage multimeter, powerprobe, china clone version of a GM MDI and some generic ‘apk’/’mot’ ODB readers.