"Ha, ha, ha."

Zhao Feng smiled and teased. "Your detector seems to be ineffective."

"What junk." Instructor Liu glanced at the detector and muttered, "The instrument always goes wrong. It's really of poor quality!"

Although it usually went wrong, he felt pity because it cost two million yuan!

However, there was no way to make up for a loss. His superiors could not blame him since he did not even touch the detector. ...