I was checking today but forgot to take out the fuse for the EFI, in the process of checking the compression, the air/fuel mixed and the car was trying to turn on. At that time, I heard a loud pop, and the compression meter flew right out of the spark plug hole. Could this have damage anything?

 

try and start the car and find out.. probally not just to much pressure to hold the tester in.. hopefully it did not strip the plug holes