Densitometer
A device that measures how densely a coffee bean is packed, by volume or by displacement.
Overview
Bean density predicts how a coffee will absorb heat. Dense beans need more energy early and tolerate a faster start; less dense beans scorch easily if treated the same way. Measuring density turns that into a decision rather than a guess.
Using it well
- High-grown washed coffees are usually denser. Expect to charge hotter and roast faster early.
- Log density alongside moisture for every lot. Together they explain most green coffee variation.
- Density changes as beans age and dry out. Re-measure long-held lots rather than trusting an old figure.
Keep the instrument dry and clean. Contamination between samples skews readings, so rinse and dry the measuring vessel between lots.
Why this matters
The densitometer sits in the charging stage of a roast. Getting it right removes one source of variation, which matters because roasting rewards consistency more than any single clever adjustment. Change one variable at a time, record what you did, and compare batches rather than judging any single roast in isolation.
If you are building a complete setup, start with the instruments that measure what is happening - a probe, a scale and a logger - before buying anything that promises a better result by itself. Measurement first, equipment second.
Educational content. Roast Lab does not sell this or any other product, and we do not accept payment for coverage. Specifications listed above describe typical ranges for the category rather than any specific model, and vary between manufacturers. Always follow the manufacturer instructions and safety documentation supplied with your equipment.
Related tools
Green Coffee Beans
Unroasted coffee in its raw, stable state - the input to every roast.
Storage Bin
An airtight container that holds a working supply of green coffee at stable humidity.
One-Way Valve Bag
A barrier bag with a one-way degassing valve, used for both green and roasted coffee.
Humidity Control Pack
A two-way humidity regulator that holds a container at a target relative humidity.