Loupes are used in a number of industries, notably the jewellery trade, watchmaking, photography, printing, dentistry, education, ophthalmology, geology, & biology. Amateur naturalists may also find a hand lens or a loupe a useful tool when looking at or identifying species. They are also used in numismatics and stamp collecting.
This set of three singlet loupes from Hobby Tool Supply is a perfect, basic set that can be used easily and effectively by anyone. The 10x & 30x single lens loupes are 21mm in diameter. The dual 10x / 20x has two 18mm & 12mm diameter lenses respectively.