The short answer
Acaia Pearl Model S scored 9.2/10 in our bench testing. The reference scale: 100 ms response, auto-tare, and an app that logs every shot you pull.
- BrewBench score
- 9.2/10
- Observed price
- $149
- Category
- Coffee Scales
- Best for
- Espresso obsessives tracking every shot
100 ms response, flow-rate visualization, and shot logging via app. Once you brew on real-time data you cannot go back — it is the closest thing to a puck microscope.
This page is the long-form view of one product from our Best Coffee Scales for Precision Brewing (2025) round — 31 hours of instrumented testing plus a nine-person blind panel. The full protocol is published, and so is every number behind the score.
What we like and what we don't
What we like
- Real-time flow-rate readout exposes grind errors instantly
- 0.1 g resolution with sub-second stabilization
- Water-resistant coating survives espresso bar splashes
What we don't
- Price rivals a budget grinder
- App is great, but adds setup friction
Measured specifications
What the bench recorded
- Resolution
- 0.1 g
- Max load
- 2 kg
- Response
- ~100 ms
- Battery
- USB-C, ~25 h
- Footprint
- 13 × 13 cm
- Modes
- Espresso auto-start, pour-over
Common questions
FAQ
Is the Acaia Pearl Model S worth it?
BrewBench graded the Acaia Pearl Model S 9.2/10. The reference scale: 100 ms response, auto-tare, and an app that logs every shot you pull. We recorded $149 as the US retail price when we tested it (2025-11-05) — street prices move, so check the current price before you buy.
How did BrewBench test the Acaia Pearl Model S?
The Acaia Pearl Model S was part of our Best Coffee Scales for Precision Brewing (2025) round: 31 hours of instrumented testing for this category — particle analysis for grinders, thermocouple logging for machines and kettles, 10 Hz scale capture for pours — followed by a nine-person blind panel with coded cups. The full protocol and every pick are in the guide.
Who is the Acaia Pearl Model S best for?
It is built for Espresso obsessives tracking every shot. The strongest thing we measured: real-time flow-rate readout exposes grind errors instantly. The main trade-off: price rivals a budget grinder
Where can I buy the Acaia Pearl Model S?
We link out to Amazon with an affiliate tracking link — we may earn a commission, which never changes a score or a pick. The price above is the one we observed at test time, not a quote from BrewBench: we do not sell this product.