One-line verdict

For travelers and minimalist espresso users who want a tiny, rechargeable scale that still delivers 0.1 g accuracy and basic timer, it undercuts the Hario Polaris on price and rechargeability but has the smallest platform in the lineup.

How it compares

vs Timemore Black Mirror Basic 2 ($65): Nano wins on ultra-compact size and lower price, Basic 2 wins on larger platform and flow-rate graph
vs Hario Polaris ($89): Nano wins on USB-C charging and battery life, Hario wins on slightly slimmer portafilter fit

What verified buyers consistently say

Praised (mentioned in >41% of positive reviews)

Pocket-sized and feather-light for travel or tiny counters
USB-C rechargeable battery lasts weeks between charges
Surprisingly stable 0.1 g accuracy in such a small package

Criticized (mentioned in >28% of negative reviews)

Tiny platform limits use to single cups or small portafilters only
No flow-rate graph or advanced modes like bigger Timemore models
Buttons are small and can be fiddly with wet hands

Best for

Travelers, ultra-minimalist espresso setups, users with space constraints

Not for

Pour-over with any carafe larger than a V60, users needing large-platform stability

Specifications

Spec	Value
Precision	0.1 g
Max Weight	2 kg
Timer	Basic manual/auto
Power	USB-C rechargeable
Dimensions	4.3” W x 3.9” D x 0.6” H
Weight	0.4 lbs

Data sources

15,678 verified purchase reviews via Amazon, Timemore direct, Whole Latte Love
Review period: January 2024 – March 2026
Sentiment confidence: high based on sample size

Timemore Black Mirror Nano Coffee Scale