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No, mil spec tubes are mass produced, they do not come with spec sheets, but they must  meet specific requirements for military use. 

Night vision goggles amplify available ambient light (like moonlight or starlight) using image intensification technology, converting photons into electrons and projecting an enhanced image of the surroundings.

• Gen 1: Basic, affordable option with limited range and clarity.
• Gen 2: Mid-level technology with improved resolution, range, and better low-light performance.
• Gen 3: The most advanced option used by military forces, offering superior resolution, durability, and performance in extreme low-light conditions.

Night vision devices need some ambient light (like moon or starlight) to work. However, most models come with an IR (infrared) illuminator that allows them to function in complete darkness.

Many high-quality night vision goggles are waterproof or water-resistant, making them suitable for use in harsh weather conditions. Check the product specifications for IP ratings.

The effective range varies depending on the generation and model of the night vision goggles. Gen 1 models might provide visibility up to 75 yards, while Gen 3 devices can extend visibility to 300+ yards under ideal conditions.

Yes, night vision goggles are legal for civilian use in most countries, though there may be restrictions on the sale or export of military-grade devices.

Thermal imaging detects heat signatures emitted by objects, making it effective in total darkness, through smoke, fog, or vegetation. Night vision, on the other hand, amplifies available light and requires some ambient light.

Thermal imaging is widely used for security, hunting, firefighting, surveillance, and search-and-rescue missions, as it excels in detecting heat signatures from people or animals.

Yes, thermal imaging devices work both day and night since they rely on heat, not light, to create images. They are unaffected by lighting conditions.

Environmental factors like rain, fog, and glass can reduce the effectiveness of thermal imaging devices. While they can "see" through smoke, their performance can decrease in heavy rain or through thick obstacles.