Accessory · Coffee scale
Timemore Black Mirror Basic Coffee Scale
A small, precise 0.1g digital scale with a built-in timer — the accessory that makes dose and yield ratios (the actual basis of a repeatable espresso recipe) measurable instead of guessed.
Our review
Who should buy it
Anyone following a dose-and-yield-based espresso recipe (which is most of the guidance on this site) who does not already own a precise kitchen or coffee scale.
Who should avoid it
You already own a 0.1g-precision scale with a timer — this does not add capability beyond that.
Key specifications
| Type | Digital coffee scale with built-in timer |
|---|---|
| Precision | 0.1g |
| Weighing range | Approx. 0.5g–2000g, per retailer specification listing |
| Timer | Built-in brew/shot timer |
| Battery | Rechargeable, manufacturer-stated approx. 15-hour battery life |
| Charging port | USB-C |
| Dimensions | Approx. 152mm x 130mm x 26mm (5.9" x 5.1" x 1.0") |
| Weight | Approx. 380g |
| Warranty | Not specified by the manufacturer for this model on the retail listing reviewed |
What the manufacturer documentation says
The retail listing we reviewed for this scale (no official English-language Timemore manufacturer site could be verified) documents 0.1g precision, an auto-start/stop timer function tied to detected flow, and a compact form factor sized to fit under a portafilter or a pour-over dripper without needing a large base.
Timemore documents the Black Mirror Basic as a 0.1g-precision digital scale with a built-in timer, a rechargeable battery rated at approximately 15 hours, and USB-C charging — specs aimed squarely at espresso and pour-over use, where both dose (grams of coffee in) and yield (grams of espresso out) need to be measured, not eyeballed, to repeat a good shot.
What those specifications mean in practice
The 0.1g precision figure is not a rounding-error distinction from a typical 1g-precision kitchen scale: at an 18g dose, a 1g measurement error is over 5% of the total recipe, easily large enough to shift a shot from balanced to sour or bitter. Unlike a kitchen scale, this level of precision is specifically what makes a documented recipe (say, "18g in, 36g out, 28 seconds") actually reproducible rather than approximate.
A stated 0.5g–2000g range is wide enough to cover both a single espresso dose and a full pour-over brew on the same device, which matters in practice for a household that makes both — one scale that handles a 9g single-basket dose and a 400g pour-over kettle-and-server weigh-in, rather than needing separate tools for each.
Workflow and usability implications
A built-in timer that starts automatically when it detects flow removes a small but real point of friction: without it, dialing in a shot means either eyeballing time or juggling a separate phone timer while also watching the scale and the shot color — one fewer thing to coordinate by hand while your other hand is on the portafilter or steam wand.
A compact base matters more than it looks like it would on a spec sheet: many drip trays are shallow enough that a bulky scale either does not fit underneath the portafilter at all, or fits but tips when a spouted portafilter's streams land off-center. This scale's smaller footprint is specifically suited to sitting directly under a portafilter rather than needing to be positioned to one side.
Heating, brewing, and grinding implications
Because dose and yield are both defined in grams (see our dose, yield, and time guide), a scale is not really optional if the goal is a recipe you can repeat on purpose — it is closer to a prerequisite for every dial-in guide on this site, in the same way a thermometer is a prerequisite for a temperature-sensitive recipe rather than an optional nicety.
Upgrade path
For most home users, this level of precision and features is not something to "upgrade" away from — the realistic reasons to replace a scale like this are physical durability, battery degradation over years of use, or wanting a larger weighing surface for a bigger brewing setup, not a lack of precision.
Pros
- 0.1g precision is fine enough to weigh both espresso dose and yield accurately
- Built-in timer removes the need for a separate phone timer during a shot
- Rechargeable battery with USB-C charging avoids ongoing disposable-battery cost
- Compact footprint fits under most portafilters and small brew setups
Cons
- Not specified by the manufacturer whether the scale is splash- or spill-resistant
- Warranty terms are not detailed on the retail listing reviewed
- Battery life claim (approx. 15 hours) is the manufacturer's stated figure, not independently verified here
Value and buying decision
Based on the retailer-documented specifications (no official manufacturer source could be verified for this model), a 0.1g scale with a built-in timer is inexpensive relative to the machine and grinder it supports, and it is the single accessory most directly responsible for turning any of the recipes described in our guides from a rough approximation into a repeatable number. Of everything in this catalog, it is also the easiest purchase to justify regardless of which machine or grinder you end up choosing.
Manufacturer documentation
- Amazon product listing — TIMEMORE Black Mirror Basic Coffee Scale — Secondary source: retailer/Amazon specification listing (no official Timemore US manufacturer page could be located)
Specifications last verified against manufacturer sources: August 27, 2026
Frequently asked questions
Is 0.1g precision necessary for espresso?
For dialing in a repeatable ratio, yes — a 1g swing in an 18g dose is over 5% of the recipe, which is enough to change a shot noticeably. Coarser kitchen scales usually round to a full gram or more.
Does it work for pour-over too?
Yes — Timemore markets this as a dual-purpose espresso and pour-over scale, and the built-in timer suits either use.
How long does the battery last?
Timemore states approximately 15 hours per charge over USB-C; actual runtime will vary with display use and auto-shutoff settings.