tool for checking engine light warning

tool, wire, ordinary, connect, light, engine, warning, checking, question, recommend, important, metal, piece, terminals, 09843-18020

i just have a question about the tool that is for checking engine light warning. according to BGB the SST 09843-18020 is the tool i need to use to connect E1 and TE1. my question is can i use a ordinary wire to connect the two terminals, or is it really important to use the tool they recommend, the SST? its just to me the SST looks like just a piece of ordinary metal wire. thanks