Almost every site in this category says it tested a dozen. We have not looked through a single one, and we would rather say so than pretend. What we did instead: compiled the published manufacturer specifications with every source named, computed what each telescope can actually resolve from its own stated aperture, and checked the price this morning.
If a box claims 525x, we show you the number the optics can really deliver and where that number comes from. Every figure on this site is either published by the maker, with a link to the document it was read from, or computed from one of those figures by a formula we state in full. There is no third category.
Read the methodology — the formulas, the sources for each one, and exactly what we do and do not do.