Investigating a crime scene demands the right tools. When it comes to looking for metal objects, you can't do any better than the Thames & Kosmos Pocket Metal Detector. You can find what you're looking for through paper, fabric, and even soil. When it finds metal, such as coins or other objects, it emits a beep to let you know. There's a knob for adjusting sensitivity so you can get the setting just right. You will never walk into a crime scene unprepared again with this in your pocket.