Affordability - Based on intial cost, warranty, ruggedness, and attachachable lens covers.

Capability - Based on image quality, field of view, battery life, environmentally sealed, magnification options, dual mode, and polarization filter.

Deployability - Based on size, surface finish and noise.

Maintainability - Based on batteries and battery replacement.

Usability - Based on weight, user-friendliness, ergonomics, size of controls, and single-handed usage.