Telescopes or Monoculars are mini-telescopes which you look through with only one eye. They make distance objects clearer and some can magnify for near as well by changing the focus. Monoculars are pocket-sized and portable so can easily be carried outdoors.  Unlike magnifiers the bigger the telescope, the stronger it is and strengths range from 2.5 x to 10x magnification.  Weaker monoculars can be mounted onto spectacles but the stronger ones are too heavy.