Refractometer
An instrument that measures how much a liquid bends light and converts that to an estimate of dissolved solids in the finished drink. It is borrowed from speciality coffee, where it is used with a brew weight to compute an extraction yield, and the borrowing carries assumptions that do not transfer cleanly to tea.
Identity
- Category
- Measurement
- Also called
- digital refractometer, Brix meter, extraction meter
- Material
- Optical prism with a digital sensor, or a handheld analogue scale
- Skill level
- Advanced
Porosity
Not porous. It contributes nothing of its own to the liquor, so it can be moved between teas freely and washed with detergent without consequence.
Where it comes from
Modern, adopted from winemaking and speciality coffee.
Named here rather than presented as generic equipment. The object belongs to a practice, and TeaHQ describes it from the outside.
If you do not own one
Tasting the tea, and a scale for the leaf. TeaHQ’s honest position is that a refractometer tells you very little about tea: tea liquor carries far fewer dissolved solids than coffee does and varies across a narrower range, a great deal of what a drinker responds to in tea is aroma rather than dissolved solids, and the coffee-derived conversion factors were not derived from tea. The number it gives is real and mostly does not answer the question anyone asked.
This one is not marked essential. The tea can be made without it.
Care and maintenance
Calibrate against distilled water before a session. Wipe the prism between samples; tea residue on the prism biases every subsequent reading upward. Cool a sample to the instrument’s reference temperature before reading it.
Other measurements
Sources
This page is TeaHQ synthesis. No external source stands behind the description, the material or the account of how the object is cared for. Where the record names a tradition, that attribution is TeaHQ’s own reading of common practice rather than a citation.
TeaHQ names no maker, brand or shop and has nothing to sell. Nothing on this page should be read as advice to buy the object — the substitute note above exists because owning it is usually optional.