i agree with kmo. i got the radio shack microscope.. it looks almost identical to the 420scope, and half the price. works killer.. or you can get a 30x jewlers loupe online for under $10, and these also work great.. it is almost impossible to get a good read on trics just using the naked eye..
one last good method to use is with a digital camera.. just see if it has a macro setting, and this can also be used with great affect to check out the trics.. i have seen some great pix taken with the macro setting on a cheap digital camera..
hope these tips help you out some..