# Jeweler's loupe

> A small handheld magnifier, typically 30-60x for cannabis use, used to inspect trichome heads and spot pests and male flowers.

- Canonical: https://genetixbay.com/knowledge/glossary/jewelers-loupe.html
- Also written: jewellers loupe, jeweller's loupe, loupe, jewelers loupe, pocket microscope, trichome scope
- Glossary category: Harvest, drying and curing
- Status: Draft: awaiting expert review · Updated: 2026-10-31
- Licence: CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/), attribute "GenetixBay cannabis glossary"

A jeweler's loupe is a small folding magnifying lens built for close inspection of gems. Growers use loupes, and increasingly cheap pocket digital microscopes, to look at [trichome heads](https://genetixbay.com/knowledge/glossary/trichome-heads.md), early [pre-flowers](https://genetixbay.com/knowledge/glossary/pre-flower.md), anthers on suspected [intersex plants](https://genetixbay.com/knowledge/glossary/hermaphrodite.md), and tiny pests such as [mites](https://genetixbay.com/knowledge/glossary/two-spotted-spider-mite.md) and thrips.

## In practice

Magnification matters:
- **10-20x**: enough for sexing pre-flowers and spotting spider mites.
- **30x**: borderline for [trichome colour](https://genetixbay.com/knowledge/glossary/trichome-ripeness.md); you see heads but not reliably cloudy versus clear.
- **60-100x**: comfortable for judging clear, cloudy and amber heads, and for broad and [russet mites](https://genetixbay.com/knowledge/glossary/hemp-russet-mite.md), which are near-invisible below this.

Tips: steady your hand against the plant or use a clip-on stand; use daylight or a neutral white torch rather than the grow light, because purple-pink [LED](https://genetixbay.com/knowledge/glossary/led.md) light makes heads look misleadingly amber; check bract [trichomes](https://genetixbay.com/knowledge/glossary/trichome.md), not sugar leaves.

A phone-attached clip lens or USB microscope lets you photograph heads for a grow journal and compare day to day, which makes the call far more objective.

## Don't confuse with

- **Magnifying glass**: usually 2-5x, too weak for trichomes.
- **Microscope**: higher magnification, normally bench-mounted.
- **Trichome ripeness**: what you judge with the loupe.

## Related terms

[Trichome ripeness](https://genetixbay.com/knowledge/glossary/trichome-ripeness.md), [Harvest window](https://genetixbay.com/knowledge/glossary/harvest-window.md), [Trichome](https://genetixbay.com/knowledge/glossary/trichome.md)

## Read more

- [Trichome ripeness: clear, cloudy, amber, and what the evidence says](https://genetixbay.com/knowledge/harvest-cure/trichome-ripeness.md)