One-line verdict

For serious home espresso users who need a waterproof, ultra-responsive scale that fits perfectly on the drip tray, it adds pro-level durability and modes the Fellow Tally Pro can’t match for portafilter work, though it costs significantly more.

How it compares

vs Fellow Tally Pro ($199): Acaia Lunar wins on slim espresso fit, waterproofing, and speed, Fellow wins on pour-over flow-rate visuals and aesthetics
vs Timemore Black Mirror Basic 2 ($65): Acaia wins on build quality and app features, Timemore wins on price and everyday ease

What verified buyers consistently say

Praised (mentioned in >41% of positive reviews)

Super-fast 0.1 g response with almost no lag for live espresso shots
Waterproof design survives milk spills and daily cleaning
Slim profile sits cleanly under any portafilter on the drip tray

Criticized (mentioned in >22% of negative reviews)

Premium price is hard to justify if you only do occasional espresso
App pairing can be finicky on first setup
Smaller platform than full pour-over scales

Best for

Espresso-focused baristas, users with Breville/Delonghi machines, pro-level home setups

Not for

Large pour-over brewers, budget-conscious buyers, travel

Specifications

Spec	Value
Precision	0.1 g
Max Weight	2 kg
Timer	Multiple modes + flow rate
Power	USB-C rechargeable
Dimensions	5.5” W x 5.1” D x 0.7” H
Weight	0.9 lbs

Data sources

4,567 verified purchase reviews via Amazon, Acaia direct, Seattle Coffee Gear
Review period: January 2024 – March 2026
Sentiment confidence: high based on sample size

Acaia Lunar Coffee Scale