Busy lifestyles require simple solutions. A monocular provides an effortless way to have an optical tool handy for any occasion. The choices are abundant whether you are looking for a high-end Zeiss monocular or a budget-friendly Brunton monocular.. You can select from a monocular as small as two inches long and weighing two ounces to a monocular measuring six inches long and weighing 11 ounces.