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The gain of a night vision device refers to the amplification capability of the image intensifier on the input light signal, expressed as the ratio of output brightness to input brightness, in decibels (dB). A higher gain value means the night vision device has stronger observation capabilities in low-light environments.

Chinese-made and American-made low-light night vision devices have distinct characteristics in terms of technological approaches, performance features, and application scenarios, reflecting the different military strategies and industrial foundations of both countries.

A "blemished image intensifier tube" specifically refers to defects in the image intensifier tube, the "heart" of a night vision device.

The core advantage of head-mounted thermal imaging lies in freeing up your hands and enabling integrated observation and action, while the advantage of handheld devices lies in higher performance and more professional observation capabilities.

A spotting scope is a high-precision monocular telescope specifically designed for observing bullet impact points on targets during shooting training and competitions.