Well, you need some magnification strong enough to see the color of the trichromes. They start clear, then go to milky, then to amber. If you want an energetic high, harvest when most are still clear & maybe 20 percent have gone milky. If you want to sleep well, harvest when most are milky & 20 percent, maybe a little more have turned amber. If they're all clear, they're not ready. If they're all amber, the THC is degrading & you've already lost potency. If they're DARK amber/brown, you're screwed! ~~~ PEACE! ~~~