I know a lot of people sware by those cheap Radio Shack pocket microscopes, but I can not stand them. If you can afford it, definitely go digital. For $100-$160 you'll get a good USB digital scope that really let's you see the details of the trichomes. However the higher magnification means you can only see a few trichomes at a time. So another nice item that I find hard to live without is a good high quality jeweler's loupe. The better brands of loupes show detail crystal clear, don't give you the upside down image, and have color corrected coating so you don't confuse cloudy vs clear vs amber. But the loupes are a lot weaker so use them to examine a wide area of leaf or nugs. Sometimes you don't need to see the trichomes, instead just looking at the overall color and ripeness through a loupe is enough.