01
Electronic engineering
System architecture, circuit design, PCB development, sensing, power, and verification.
- Analog & digital design
- Optical measurement
- Prototype to production
Electrical × software × production engineering
From first signal
to finished system.
420nm creates and industrialises connected instruments — uniting electronics, embedded software, digital experience, and the systems that prove every unit in production.
380nm
420nm
Brand wavelength
700nm
What we do
One design house.
Every critical layer.
Complex products become clearer when the disciplines behind them share one intent. We connect the physical signal to the software experience — and the finished design to a reliable production line.
02
Embedded systems
Reliable firmware that turns hardware capability into intuitive, resilient behaviour.
- Firmware architecture
- Connectivity & protocols
- Real-time control
03
Product software
Purpose-built interfaces and tools that make sophisticated instruments feel straightforward.
- Device interfaces
- Desktop & mobile
- Data workflows
04
Production engineering
DFM, factory test systems, and software that carry a design reliably into series production.
- DFM & production transfer
- Test equipment & fixtures
- Procedures & test software
Engineering should not end at a working prototype.
It should prove itself in production.
Proven in series production
400,000+
devices based on 420nm designs, produced by our clients and their manufacturing partners.
Selected work
Engineering that leaves
the workbench.
Instruments built around real measurement, real environments, and the people who rely on both.
PoolLab 1.0 / Product view
Pool water analysis
01 / 02
PoolLab® 1.0
Professional water analysis, reduced to a confident handheld workflow.
A compact platform where optical measurement, rugged electronics, embedded logic, and a connected data path have to behave as one product — at the water's edge.
- Optics
- 3 wavelengths
- Environment
- IP68
- Connection
- Bluetooth®
Electronics
Embedded
Connectivity
Product manufacturer · Water-i.d. GmbH
Visit product website (opens in a new tab)
PrimeLab 2.0 / Product view
Professional photometry
02 / 02
PrimeLab® 2.0
Laboratory capability shaped into a connected, portable platform.
Dense measurement technology becomes useful when sensing, device control, interface design, and data management share one architecture — without exposing the complexity underneath.
- Sensor
- 18 wavelengths
- Methods
- 140+
- Interface
- 5.5″ touch
Full System Design
Firmware
Product software
Product manufacturer · Water-i.d. GmbH
Visit product website (opens in a new tab)How we work
One line of thought,
from intent to impact.
We keep decisions connected across disciplines, so every prototype answers the right question and every handover carries its reasoning with it.
Frame
Define the use case, critical unknowns, and the system architecture that connects them.
Build
Develop hardware, firmware, and interfaces in parallel around testable product increments.
Prove
Validate in context, refine with evidence, and close the product's critical risks.
Industrialise
Apply DFM, build production test equipment, codify procedures, and support the ramp.
Production
Support production throughout the product lifecycle, maintaining test systems, refining processes, and managing engineering changes.
Integrated by design
One product / four connected layers
01
Electronics
Sense & actuate
02
Embedded
Control & connect
03
Software
Understand & act
04
Production
Test & release
Publicly funded R&D
Eurostars-2 joint programme
Co-funded by EUREKA + EU Horizon 2020
Research, backed
across borders.
A 420nm research and development project received funding through the Eurostars-2 joint programme, co-funded by EUREKA national funding bodies and the European Union's Horizon 2020 framework programme.
Start a conversation
Have a complex product
in mind? Good.
Tell us what it needs to do, where it needs to work, and what makes it difficult. That is where useful engineering starts.
hello@420nm.net