get a loupe....ten bucks or there about on amazon and ebay...the 60/100 ones work great. don't rely on one totally, though. watch for the pistils drawing up, wait for the "swell" then start checking trichs. look at the ones on calyxes, not on sugar leaves. a lot of the "amber" trait has been bred out of many strains, so look for as many milky and as few clear as you can get. if the strain you're running does "amber" up, wait till you have a fair percentage of amber....