The Swift SW150 is a good low-cost microscope that will get you started in amateur microscopy. It also makes a good field microscope and is also for children.
The Swift SW150 has a coarse and a fine focus knob, 4x, 10x and 40x objectives and comes with a 10x and 25x eyepiece. It can be used with batteries and a power adapter. The objectives are larger than the objectives of other introductory microscopes. While it does have 160mm objectives, they are shorter than most others (Their conjugate distance is 185mm instead of 195mm). The microscope has stage clips and a lamp (LED) both from the bottom and the top.
I recommend this microscope for children but also adults who are interested in microscopy but who do not want to spend too much money. It will allow you to do amateur microscopy, to take pictures through the eyepiece using a mobile phone and to learn the first steps. When you are more advanced, then you can upgrade to a microscope with more features, and it will not have cost you too much.
The Swift 150 microscope is one of the cheapest ways to start microscopy as a hobby, but it is not a toy microscope. This microscope can also be uded as a field microscope and for home-schooling. Naturally, there are some trade-offs that have to be made to keep the cost down. The microscope does not have a meachanical stage and also no condenser. The image quality therefore naturally is lower than the one of more expensive microscopes. It is a monocular microscope, which further reduces size and weight, making it also a good introductory microscope for children.