1. Listening device
This device apparently allows you to hear even a whisper across the room. It gets my vote for being barely visible as well – nobody likes an obvious spy. [Source]

2. Camera Spy Plane
This is a RC plane with a digital camera to take aerial shots. It also looks quite snazzy.
[Source]

3. Gryphon Personal Flying Wing
This one is kind of like the Spy Plane mentioned above except that you are spying device… with wings!
[Source]

4. Thermal Infrared Imaging Camera
Thermal infrared devices can detect human activity, the one in the image (X200XP) at up to 450m. It’s also said to provide vision in dust, smoke and complete darkness with the ability to be submerged up to 9m below water. No serious spy should be without thermal vision.
[Source]

5. Password Protector
Still scribble your passwords on the back of your notepad or relying on your dodgy memory? It seems that there’s actual hardware that acts as a password manager and apparently used by the US army.
[Source]

6. SpyCam Detector
If you’re a spy, chances are that somebody else may be spying on you. A SpyCam detector locates hidden camera. It’s portable enough to keep in your pocket and runs on AAA batteries. [Source]

7. Lock Picking Tools
For doors that don’t lock electronically, a lock picking set is essential for a spy. [Source]

8. Portable Lie Detector
How can you tell quickly if the information you’re being told is accurate? You probably can’t but you can get close by using a portable lide detector like the deFIBulator. [Source]

9. Voice changer
As a spy, there will no doubt be circumstances where you need to further conceal your identity over the phone. A voice changer can lower or raise the pitch to the extent that you can sound like the opposite gender, amongst other things. [Source]

10. Military-grade handheld portable laser
This laser can cut through or burn dark plastics and cardboard. An imaginative spy would know how or where to make use of this powerful, albeit dangerous gadget. Use with extreme care!
[Source]