Tough, water resistant, fully repairable. Connects to TopoDroid & SexyTopo over Bluetooth.
Precision hardware for surveyors who actually go underground.
Designed for wet, muddy, unforgiving environments — with repairability and simplicity at its core.
Twelve things the DiscoX does so you can concentrate on surveying.
F/01
RGB status LED & Disco Mode
A colour-coded LED band shows device state at a glance — red for stabilising, green for reading taken, purple for leg detected. Plus a dedicated button for when you've earned it.
F/03
Fully repairable
Every component can be sourced, salvaged, 3D printed, or laser cut. No proprietary lock-in — fix it and get back to surveying.
F/04
Paperless survey
Connects wirelessly to TopoDroid and SexyTopo. Take readings and send them straight to your phone — zero paper, fewer errors.
F/05
Onboard calibration
An intuitive calibration algorithm runs entirely on the device. No laptop, no second device, no faff.
F/06
Anomaly detection
Readings are auto-checked for magnetic interference from helmet lights, watches, or bolts. Get alerted before bad data enters the survey.
F/07
Extended range
Long-range Bluetooth delivers 20m+ line-of-sight, keeping you connected to your phone at a distance without babysitting the pairing.
F/08
Sealed USB-C
A resin-capped USB-C port isolates internals while providing easy access for charging and editing device settings.
F/09
Configurable
Tweak settings from the onboard menu, or plug in and edit settings.json directly on your PC.
F/10
Accurate battery
A dedicated battery monitoring IC gives reliable charge readings — no more guessing whether you'll make it out of the cave.
F/11
Gorilla Glass & Quartz
Scratch-resistant Gorilla Glass display cover and quartz glass laser protector handle the scrapes and bumps of cave life.
F/12
Open & reprogrammable
Build with C++ or optionally CircuitPython. Inspect the code, modify behaviour, flash your own firmware. It's your device.
Field benchmark · 003
Tested against the competition.
Fourteen legs surveyed in Giants Hole, Derbyshire, on 2026-02-28 — DiscoX measured side-by-side
against SAP, DistoX2, and Cavway. The numbers speak for themselves.
GIANTS HOLE · 2026-02-28 · 14 LEGS
Mean error · short-cal
4.5 cm
DiscoX (short-cal) places second of five devices — on par with Cavway, well ahead of DistoX2 and SAP.
Versus DistoX2
−41%
DiscoX short-cal produced 41% lower mean error than the DistoX2 across the same 14 legs.
Fore/back symmetry
±0.5cm
Foresight and backsight errors stay tightly matched — a sign of good sensor calibration and low drift.
Technical spec · 004
What's inside.
A breakdown of the hardware, sensors and components that make the DiscoX a reliable cave survey instrument.
Range
Up to 100m in ideal conditions
Connectivity
Bluetooth LE — TopoDroid v6 & SexyTopo
Interface
4 membrane buttons
Display cover
Gorilla Glass
Laser cover
Quartz glass
Processor
M4 microcontroller
Battery
1200mAh · ~125mA average draw
Charging
USB-C · resin-sealed port
Case
Polycarbonate & PETG · internal epoxy coating
Water resistance
Sealed design — theoretically waterproof, not guaranteed for submersion
