Dosing Scale With Timer for a Commercial Espresso Bar

Every espresso bar eventually hits the same decision: eyeball the shot by volume and hope the crema doesn’t lie to you, or put a scale and timer under the portafilter and read the actual liquid weight and pull time. The hardware choice that follows isn’t really about brand loyalty, it comes down to five things that vary a surprising amount between otherwise similar-looking scales: how fast it reacts to the pour, how well it survives a wet bar, how it fits under your group head, its resolution, and how it is powered. This guide compares five scales sold on Amazon and three sold by their makers, adds a graduated shot glass, and explains why two common brewing scales do not fit a commercial espresso bar. It also distinguishes shot weighing from grinder-side dosing gear.

The comparison uses maker product pages and the brands’ own Amazon listings. Match the scale’s dimensions, water rating, and timing modes to your espresso station before buying.

For handling spent grounds at the espresso station, see the knock box guide.

The Amazon product cards below use affiliate links; we may earn a commission at no extra cost to you. FranchiseFeast is a participant in the Amazon Associates Program. As an Amazon Associate I earn from qualifying purchases.

Quick picks

• Wet bar: BOOKOO Themis Ultra, with a maker-stated IP67 rating.
• Low-profile under a portafilter: Acaia Lunar or Timemore Nano, available from their makers.
• Five modes with automatic timing: Felicita Arc.
• Compact espresso station: KNODOS Smart Coffee Scale.
• Espresso plus pour-over: Timemore Black Mirror Basic 2.
• Auto-tare and timer modes: Brewista Smart Coffee Scale III.
• Volume alongside weight: Rattleware graduated shot glass.

What “dosing scale with timer” means here, and what it doesn’t

Search this phrase and you’ll get pulled in two directions. One is the dosing-cup scale that sits under a grinder’s dosing funnel and weighs whole or ground beans before they go into the portafilter, the kind covered in our commercial coffee grinders guide, which also covers grind-by-weight (GbW) grinders that build that same bean-weighing function into the grinder itself. The other is the scale this article is about: the one that sits under the portafilter or shot glass, weighs the liquid espresso as it drips out, and times the pull automatically. Same word, “dosing,” two different jobs at two different stages of the workflow, dose-in versus yield-out. A bar can use both, and neither replaces the other.

There’s a second naming collision worth flagging before you search further: our water filtration guide also uses the word “scale,” meaning mineral or limescale buildup inside the machine’s boiler. That’s an unrelated meaning of the same word. Nothing in this article touches water hardness or descaling.

For context on why this distinction matters: Daily Coffee News’s July 2026 coverage of single-dose coffee dispensers describes grind-by-weight systems as accurate dosing for high-volume cafes and covers newer bean dosers such as the Acaia Orion and the Weber Workshops Bean Counter. All of that activity is grinder-side. None of it changes what a shot-timer scale does at the group head, which is the narrower, independent decision this article covers.

The five things that actually separate these scales

The scales differ in their timing modes and flow-rate displays. Start with these five practical checks.

Resolution

Most scales here read to 0.1g at espresso weights. Only the Acaia Lunar lists a switchable 0.01g mode (Acaia: 0.1 g / 0.01 g), and the Hario V60 scale reads 0.1g only from 2g to 200g, 0.5g from 200g to 500g, and 1g above that, per Hario. For day-to-day bar use, 0.1g is a workable resolution, not a compromise.

Response speed

Response speed matters most for the actual decision a barista makes mid-shot: when to stop pulling. A scale that lags behind the real flow will show a materially wrong yield right when it’s needed. BOOKOO states its Themis Ultra responds in under 100 milliseconds on its own manufacturer page. Acaia’s cited specifications do not publish a response-time figure.

Water resistance

BOOKOO publishes an IP67 rating for the Themis Ultra. Acaia describes the Lunar as water-resistant anodized aluminum without an IP number. The cited maker sources publish no water rating for the Felicita Arc, Timemore Nano or Basic 2, KNODOS, Brewista III, or MHW-3BOMBER Micro. Hario explicitly says its V60 scale is not water resistant.

Footprint under the portafilter

The Acaia Lunar measures 105 x 105 x 15 mm, BOOKOO Themis Ultra measures 127 x 112 x 18 mm, and KNODOS measures 10 x 10 x 2 cm. Timemore lists the Nano at 3.9 x 4.5 x 0.8 inches. The MHW-3BOMBER Micro has an 85 x 85 mm footprint; its maker does not publish a height. Larger brewing scales include the Acaia Pearl at 160 mm square and Hario V60 at 120 x 190 x 29 mm. Measure your tray and the clearance for the scale plus cup under the portafilter before choosing.

Battery vs. USB-C

Maker-stated runtimes run from up to 15 hours (Timemore Nano, USB-C rechargeable per Timemore) and 30 to 40 hours of continuous use (Acaia Lunar, 3.7 V 1100 mAh lithium-ion) up to 72 hours (BOOKOO Themis Ultra). Hario’s page says its V60 scale includes batteries and does not describe a USB-C charging port, so check the listing for the power source.

Does weighing your shots actually make better espresso?

Short answer: it makes your measurement reliable, not your recipe good. Volume is a fuzzy read at the espresso scale, since a shot’s crema-to-liquid ratio shifts from pull to pull for reasons that have nothing to do with strength, so a “30ml” shot can be mostly crema one day and mostly liquid the next. Weight doesn’t have that problem. Weighing dose and yield is a more repeatable measurement than eyeballing volume, which is the reason to buy the scale at all.

It isn’t a claim that a scale makes better-tasting coffee on its own. A scale can only help a barista hit whatever recipe (dose in, yield out, target time) they’ve already chosen, more precisely and more repeatably, shift to shift and barista to barista. It has no opinion on whether that recipe is a good one. If your espresso already tastes off, a faster or more accurate scale won’t fix the underlying recipe, grind, or bean; it will only tell you exactly what you’re pulling.

Who this is for, and who should skip it

This guide is for the cafe owner or manager choosing the scale and timer hardware that sits under the portafilter or shot glass at the group head, whether outfitting a bar from scratch or replacing one that’s slow, unreliable, or won’t survive a normal shift’s worth of splashes.

Skip this article, and go elsewhere on the site, if you’re actually looking for: a grinder with a built-in dosing scale (grind-by-weight), covered in the commercial coffee grinders guide; the machine itself, boiler type, group count, electrical draw, covered in the commercial espresso machines guide; or mineral scale and water hardness, covered in the water filtration guide. And within this category itself, two other brewing scales are worth naming as deliberate skips for a commercial espresso bar specifically: the Acaia Pearl is Acaia’s general-purpose brewing scale, sized and shaped for pour-over rather than the tight footprint of a group head, and Hario’s V60 scale is a pour-over-first tool, listed at 120 by 190 by 29mm and, per Hario’s page, not water resistant. Both are legitimate products; neither is the right shape for a busy espresso station.

The picks

Scale	Resolution	Max capacity	Water rating (per maker)	Footprint and height	Power	Auto-timer	Where to buy
Felicita Arc	0.1 g	2000 g	not published	not published	not published	Yes	Amazon card
BOOKOO Themis Ultra	0.1 g	2000 g	IP67	127 x 112 x 18 mm	2000 mAh, USB-C; up to 72 hours	Yes	Amazon card
Timemore Black Mirror Basic 2	0.1 g detection	2000 g	not published	not published	1600 mAh, Type-C; 24 hours	Yes	Amazon card
KNODOS Smart Coffee Scale	0.1 g for espresso; 1 g up to 2000 g	2000 g	not published	10 x 10 x 2 cm	USB-C; runtime not published	Yes	Amazon card
Brewista Smart Coffee Scale III	0.1 g	2000 g	not published	not published	USB rechargeable; runtime not published	Yes	Amazon card
Acaia Lunar	0.1 g; 0.01 g high-readability mode	2000 g	Water-resistant anodized aluminum; no IP number	105 x 105 x 15 mm	1100 mAh, USB-C; 30–40 hours	Yes	Maker
Timemore Black Mirror Nano	0.1 g	2000 g	not published	3.9 x 4.5 x 0.8 in	Type-C; up to 15 hours	Yes	Maker
MHW-3BOMBER Cube Coffee Scale 3.0 Micro	not published	not published	not published	85 x 85 mm; height not published	not published	not published	Maker

Amazon scale picks

Five modes with automatic timing

Felicita Arc Coffee Scale with Timer

Readability and capacity

0.1 g up to 2 kg

Modes

Weight, dual time/weight display, pour-over timing, espresso timing, espresso automatic timing

Flow rate

Real-time flow-rate indicator

Automatic modes handle timer start/stop or tare, with separate timing modes for espresso and pour-over. Choose the mode that matches how you start and finish a brew.

Specs: Felicita's own Amazon listing, checked Oct 2026

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Wet-bar pick with a maker-stated IP67 rating

BOOKOO Themis Ultra Coffee Scale

Dimensions and weight

127 x 112 x 18 mm; about 380 g

Readability and capacity

0.1 g; 2000 g

Water rating and response

IP67; under 100 milliseconds

Power

2000 mAh, USB-C; up to 72 hours

Modes

Weight, Flow with optional auto, Ratio with optional auto

The published IP67 rating and under-100-millisecond response make this a candidate for a splash-prone espresso station. Its 18 mm height still needs to fit below your cup and portafilter.

Specs: BOOKOO manufacturer product page and BOOKOO Amazon store listing, checked 2026-10-15

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BOOKOO’s help-center firmware note is filed under Themis Mini: older firmware, including 1.0.8, can cause abrupt shutdowns, and the documented fix is an update to 1.2.0. That note concerns the Mini rather than establishing an Ultra fault.

Espresso plus pour-over

Timemore Black Mirror Basic 2 Coffee Scale

Range and detection

0.1–2000 g; 0.1 g detection

Timing

Auto timing starts on weight change

Flow rate

Flow-rate function separate from timer

Power

1600 mAh, Type-C; 24 hours per charge

Weight-triggered timing and a separate flow-rate function support espresso and pour-over workflows on the same scale.

Specs: TIMEMORE Amazon store listing for Basic 2, checked 2026-10-15

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Timemore’s current site lists the newer Basic 3.0 at 140 x 120 x 20 mm and 300 g, with IPX3 water resistance and up to 24 hours of use; those specifications belong to the 3.0, not the Basic 2 card above.

Compact espresso scale with cup detection

KNODOS Smart Coffee Scale

Dimensions

10 x 10 x 2 cm

Resolution

0.1 g for espresso; 1 g precision up to 2000 g

Modes

Basic, espresso, pour-over ratio, pour-over weight; flow-rate indicator

Automation

Cup detection, auto-tare, timing starts with the shot

Power

USB-C rechargeable

A 10 cm square footprint and automatic cup-and-shot workflow suit a compact espresso station. Its two pour-over modes add ratio or weight tracking.

Specs: knodos.com product page and KNODOS Amazon store listing, checked 2026-10-15

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Brewista's current scale with auto-tare and timer modes

Brewista Smart Coffee Scale III

Readability and capacity

0.1 g; 2000 g

Modes

Five modes, including pour-over M1 and espresso M2/M3

Features

Auto-tare, timer, auto-off

Power

USB rechargeable

Included

Protective cover and silicone pad

The III combines five modes with USB recharging and a silicone pad. Brewista's current catalog lists this model, with automatic timing available for espresso.

Specs: Brewista Amazon store listing and current brand catalog, checked 2026-10-15

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Shot glass for checking volume

Shot glass for checking volume alongside the scale

Rattleware 3 oz Double Wall Espresso Shot Glass, Graduated

Capacity

3 oz

Markings

Ounces and milliliters

Material

Double-wall glass

Model and SKU

02169; 5004981

Use the ounce and milliliter graduations when you want a volume reading alongside the scale's weight reading. Tare the glass before pulling a shot into it.

Specs: Rattleware manufacturer page for SKU 5004981, checked 2026-10-15

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Buy from the maker

Acaia Lunar: 105 x 105 x 15 mm, 265 g, and 2000 g capacity. Readability switches between 0.1 g and a 0.01 g high-readability mode. Its 1100 mAh battery charges by USB-C and provides 30–40 hours of continuous use. Acaia describes water-resistant anodized aluminum without an IP number. Automated brewing modes start a timer or tare.

Timemore Black Mirror Nano: 3.9 x 4.5 x 0.8 inches, 0.51 lb, 2000 g capacity, and 0.1 g intervals. Type-C charging supports up to 15 hours of use. Automatic timing starts on a weight change, and a flow-rate display supports pouring. Timemore does not publish a water rating for this model.

MHW-3BOMBER Cube Coffee Scale 3.0 Micro: an 85 x 85 mm footprint and 138 g weight, with Manual, Pour-Over, and Espresso modes. The maker does not publish the scale’s height, capacity, resolution, power specifications, water rating, or automatic-timer behavior on the cited page. Check these requirements before choosing it for your station.

Matching the scale to your bar

Start with the two specs that matter most for daily espresso service: response speed, since that’s what you’re reading in the two or three seconds before you decide to stop the shot, and a confirmed water-resistance number, since a splash-heavy bar is a harder environment than a quiet counter. Resolution below 0.1g and multi-day battery life are nice to have but rarely decide the purchase. Then measure your actual clearance under the group head’s drip tray before ordering; a scale that’s a few millimeters too tall or too long is a bigger daily annoyance than any spec sheet number.

If you’re equipping the bar from the ground up rather than adding one piece, start with the full coffee shop equipment list, and pair this scale decision with the puck-prep tools it’s typically used alongside, including a tamping station and a WDT tool. For the grinder-side dosing decision this article deliberately leaves out, see the commercial coffee grinders guide.