I have some less expensive loupes, but they do not have the stated magnification. I have a 10x triplet that is much stronger than one single-lens magnifier I have that is labeled 30x. FWIW, I also have a 20x triplet which is far too powerful. It can only be used in sunlight and the field of view shows maybe five trichromes that look like oak trees! Neither Zeiss nor B&L even make a 30x magnifier, although B&L makes a 14x triplet I wouldn't mind owning.