ashley2times:
There are more signs that just trichromes that indicate when your plant will be ready, but unless you have an extensive growing background you are best to use the loupe/microscope to determine the ideal chop date.
BTW: your plants look great, no worries about the few burnt leaves, all will be good.
Dr. Jekyll
Don't be a cheap ass fool as go buy a damn $12 loupe and be done with it!
Mr. Hyde