A true 30x loupe is overkill. A 20x quadruplet is difficult to use inside without high powered lights and a stable platform. A 10x triplet jeweler's loupe of the kind gemologists use to examine interior flaws in diamonds is what is needed. Either a 10x or a 20x will allow you to examine trichromes very easily. I've used Bausch and Lomb in the past, but I think Belomo's loupes are as good and cost less. I never purchase any medicine without examining it under magnification, and neither should anyone else.