Two figures in watts, and only one of them leaves the lens · review

ATOMSTACK A20 Pro V2, 20 W output stated review

An open-frame diode engraver whose listing states 20 W of output power and a 0.08 × 0.1 mm spot, with linear guides, limit switches and a removable magnetic cover, and no working area.

By Jean-Benoit Buisson

The bottom line A clearly stated output power and a good list of mechanical safeguards. Missing the working area is a real gap on an open-frame machine, where the frame size is what defines the job.

The A20 Pro V2 listing, bullet by bullet

Five bullets: an in-house main board and spot-compression technology giving a 0.08 × 0.1 mm spot, with 20 W (20,000 mW) of output power; high-energy cutting and engraving speeds up to 400 mm/s on wood, acrylic and metal; linear-guide construction and safety features — limit switches, a cross-line light with 0.01 mm accuracy, a removable magnetic cover, safety glasses and a tilt-angle alarm; Type-C or USB-stick control with the ATOMSTACK app, LightBurn and LaserGRBL; and a laser life of up to 10,000 hours with round-the-clock service and lifetime technical support.

Output power, named as such

“Ausgangsleistung” is the word that matters. Output power is the light leaving the module, and ATOMSTACK is the only one of the five diode listings here to use it. That makes 20 W comparable in principle, as far as a maker’s own statement goes.

The A20 Pro V2 speed figure

400 mm/s is a maximum engraving speed. Cutting thicker material runs far slower, and the listing gives no time for any job; the figure bounds the machine’s motion rather than predicting results.

An open frame without its size

Everything about the frame is described except its reach. The working area is what decides whether a cutting board or a door sign fits, and it has to come from the maker’s documentation.

Availability

At the last look-up, the German, French, Italian and Spanish Amazon stores were asking 400 € to 460 €.

It is sold in the American Amazon store as well, in its own currency, which the euro figures above leave out on purpose.

The British Amazon catalogue lists the product, yet no seller was offering it.

Every figure here is Keepa’s reading on the date this page was last updated. Stock and prices can change at any time.

Prices quoted in this text were read on 15 September 2026. The live price is at the top of the page.

Where it earns its place, and where it falls short

Strengths

The only listing among the five diode engravers on this site to describe its wattage as output power
Linear guides, limit switches and a tilt-angle alarm on an open frame
A laser life of up to 10,000 hours and free replacement of defective parts, as the maker states

Compromises

No working area published
No air assist and no laser class
Engraving speed up to 400 mm/s is a movement limit, not a job time

Specifications

Optical output power	20 W (20,000 mW), described as output power (“Ausgangsleistung”), first and second bullets
Working area	Absent from the listing
Spot size	0.08 × 0.1 mm, first bullet
Air assist	Absent from the listing
Published laser class	Absent from the listing
Enclosure	Removable magnetic cover, with limit switches, a cross-line light, safety glasses and a tilt-angle alarm, third bullet
Software compatibility	ATOMSTACK app and PC software, LightBurn and LaserGRBL, over Type-C or USB stick, fourth bullet
Amazon reference	B0DHG5LNKL (same reference on 6 Amazon marketplaces)
EAN	0730654330726

Questions makers ask before buying

Is 20 W the optical power?

The listing describes it as output power, “Ausgangsleistung”, and gives 20,000 mW. That is the wording of an emitted figure. The page reports it as the maker’s statement.

Does it have a cover?

The third bullet lists a removable magnetic cover among the safety features, with limit switches, a cross-line light, safety glasses and a tilt-angle alarm. It is not described as a full enclosure.