Are you looking for a universally applicable riflescope that meets all the minimum requirements at a great price?

This Vanguard riflescope from KECK Optics, with its 4x to 16x magnification, is perfectly suited for the medium to long distances.

Illuminated reticle

The impact-resistant, etched reticle is illuminated in red, green, or blue and adjustable in multiple brightness settings.
This illuminated reticle operates on a CR2032 battery (sold separately).

Adjustable lens

A truly essential requirement for a good riflescope for air rifles and firearms is an adjustable objective.
This allows the shooter to adjust the front lens to adjust the focus and correct the parallax effect.

The eyepiece is also adjustable to adapt the scope to the shooter's eyesight.

In short,

This KECK Optics riflescope meets all the minimum requirements for a good riflescope, and also comes with extras such as an illuminated reticle, included flip-up covers, a sunshade, and even a set of mounting rings (for Weaver/Picatinny)!