A loupe with enough magnification does two things the naked eye cannot, and both of them land at a moment when you can still make a choice. You see a pest while there are still only a few, and you see how ripe your crop is while the harvest is still ahead of you.
Spotting pests before the damage shows
Spider mites and thrips are small enough that they only stand out once leaf damage has appeared. Under magnification you look at the underside of a leaf and see the animals themselves, or their eggs and webbing, at the stage where acting is still easy. What you do next is under Plant Health; this is the tool that decides whether you are in time.
Judging trichomes rather than counting weeks
The most reliable indication of harvest timing sits in the trichomes: clear, cloudy or amber. That is an observation rather than a schedule, and it is why a pocket microscope sits here among the instruments instead of under Harvesting & Drying. Look at the heads rather than the stalks, and judge several places on the plant.
45x or 60x
The LED microscope 45x is usually enough for trichomes and is the easier one to work with. The 60x gives more detail but a smaller field of view, so you hunt longer before you have the right spot. More magnification is therefore not automatically better: the further you zoom, the smaller the piece of leaf you have in frame and the more the image jumps at the slightest movement.
The Dual-Lens
The AC Infinity Dual-Lens Pocket Microscope has two lenses instead of one, so you change magnification without changing device. All three have LED lighting, which is not a luxury in a grow room: under a grow lamp the colour is wrong, and with trichomes colour is the entire judgement.
Frequently asked questions
What magnification do I need?
For trichomes 45x is usually enough and works more comfortably than more. If your main aim is recognising pests, extra magnification does help, because you are looking at something smaller that holds still.
Why is the image so unsteady?
Because at this distance every tremor in your hand is magnified along with everything else. Rest the leaf on a flat surface or brace your hand, and cut a small leaf off if need be rather than trying to hold a whole plant still.
Can I use this to check my substrate?
Not usefully. This is optical equipment for leaf and flower. For what is happening in your pot, use Soil Meters.
