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Ships as a Large Letter — assembles in 60 seconds
Flat-Pack
Pendulum Kit
A 3D-printed eddy current testing device for under €20. Your smartphone does all the measurement — the kit is pure physics.
Reserve Your Kit↓
What's in the box
Everything You Need
Four 3D-printed components, a neodymium magnet, and a steel pivot pin. Assembles by hand in under 60 seconds.
Base Plate
120 x 60 x 5mm
40mm coin well with stackable spacer support. Non-slip feet on bottom.
Upright Pillar
120 x 15 x 5mm
Snap-fit T-tab slots into the base plate. 3mm pivot hole at the top.
Pendulum Arm
80 x 10 x 3mm
4mm pivot hole for free swing. 10mm press-fit housing for the magnet.
Spacers (x5)
20 x 20 x 1mm each
Stack 0 to 5 in the coin well to fine-tune the magnet-to-coin air gap.
N42 Neodymium Magnet
10mm x 2mm disc
Press-fits into the pendulum arm. Creates the eddy current field.
Steel Pivot Pin
3mm dowel
Threads through pillar and arm. Allows the pendulum to swing freely.
Three Steps
How It Works
01
Assemble the kit
Slot the pillar into the base, thread the pivot pin through the arm, and press-fit the magnet. Takes under 60 seconds.
02
Place coin, release pendulum
Set your coin in the well, stack the right number of spacers, and release the magnet from its starting position.
03
Measure with your phone
Use the EON authentication app to track the pendulum swing. The phone computes the damping angle and compares it to the reference database.
The Physics
Why Counterfeits Can't Hide
Eddy Current Damping
When a magnet swings over a conductive metal, it induces circulating eddy currents that create an opposing magnetic field. This damps the pendulum's swing by a precise amount determined by the metal's electrical conductivity.
Gold has a unique conductivity signature. Tungsten — the most dangerous counterfeit material because it matches gold's density — has a completely different conductivity. The pendulum exposes this difference instantly.
No battery. No calibration. No expertise needed. The physics does the work — your phone reads the result.
Comparison
Flat-Pack Kit vs Alternatives
Professional
£800+
Precision Coin Cradle
- Walnut & steel construction
- Mechanical 360° dial
- No smartphone needed
- For dealers & serious collectors
Best Value
Flat-Pack Kit
€15 – €20
EON Pendulum Kit
- 3D-printed, ships flat
- Smartphone measures angle
- Same physics, same accuracy
- For every gold owner
XRF Analyser
£20,000+
Lab equipment
- Only tests surface layer
- Fooled by gold-plated tungsten
- Requires training
- For refineries only
Specifications
Kit Details
Magnet
N42 Neodymium
10mm x 2mm disc
Material
PLA Plastic
3D printed, ~20g total
Assembled
Under 60s
Snap-fit, no tools
Shipping
Large Letter
Total stack < 25mm
Gap Range
0 — 5mm
5 stackable spacers
Power
None
Pure mechanical physics
Measurement
Smartphone
Camera or visual reading
Patent
2020/0213
Priority granted
Manufacturing
Built for Scale
Printed on a Bambu Lab A1 Mini from PLA filament. Each kit costs under €1 in materials. The entire production line bootstraps for under €300.
€0.85
Cost per unit
>90%
Gross margin
15
Kits to break even
€280
Total setup cost
BATCH 1
Reserve Your Kit
3D-printed in limited batches. Reserve your place — no payment now.
0 of 50 reserved0%
€15 – €20per kit
Includes all components • Ships as Large Letter
Payment taken only when batch is confirmed. Cancel any time before.
Go Deeper
The Science Behind the Kit
The Flat-Pack Kit exploits eddy current damping — the same physics that governs MRI machines and electromagnetic braking. Read the full technical paper or try the free online simulator.