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Night vision goggles, scopes and weapon sights provide the ability to see in a dark environment.  Night vision is made possible by a combination of two approaches: sufficient spectral range, and sufficient intensity range. Private investigators may use night vision goggles, scopes and weapons sights while conducting night time surveillance investigations.

A night vision device is a device comprising an IR image intensifier tube in a rigid casing, commonly used by military forces. A specific type of night vision device, the night vision goggle is a night vision device with dual eyepieces; the device can utilize either one intensifier tube with the same image sent to both eyes, or a separate image intensifier tube for each eye. Other types include monocular night vision devices with only one eyepiece which may be mounted to firearms as night sights.

SpyGear4u.com has a variety of night vision devices including night vision scopes, night vision goggles, night vision binoculars and monoculars.  SpyGear4u Night Vision