Looking through keyholes? Or the Reverse Peephole Door Viewer!

(5 votes, average: 3.8 out of 5)

This really cool Reverse Peephole Door Viewer gadget will allow you to look behind doors that have peepholes! This was developed by Law Enforcement agencies for risk assessment when storming properties!

The device is based on simple physics and will add additional lenses to that of a door to allow you to look into the property behind. The device shown is designed for homes in the US, but I imagine it would work on many properties in the UK too!

Just a tip, make sure that your peephole window is covered up!