1974-1976 CVA 67 USS John F Kennedy
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I like these for checking for things. My eyes can see through it.
Electronic ones work better for finer scoping but this thing you can spot a thrip, or a female hair…or most things.
The magnifier is 30mm wide or about 1 1/4 inches 
The ones i got that were cheap are the size of a dime.
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i initially bough the loupes to look at trichs. now i seem to use them mostly to check on bugs.
i believe you will get to a point when you no longer require the loupe to tell when they are ready… especially if it’s a strain you have grown out several times.
i think i have a harder time figuring out when sativa dom plants are ready. i have a lot less experience with those so still check with the loupe from time to time. the kush/indica strains are pretty blatant about when they are ready. lol. no loupe necessary. then it just becomes an issue of wether you want to harvest early or late for specific effects.
i was el cheapo and got one of those 30x/60x lens loupes.
https://a.co/d/9ROGrRW
wish i had just splurged (the extra 3-5 bucks) and got the nice german 30mm magnifier.
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Years ago I bought a Micronata hand held microscope at Sharper Image. Lasted more than ten years. Those stores are gone but I replaced it with a knock-off for about $12 online. Has 30x magnification so you see tricomes like the photo posted above. Even has a light on it.