Learning / 15.10.2026
How to choose a tattoo machine: making sense of the specifications
Compare tattoo machines by exact model, stroke, power and compatibility, with practical questions for reading a specification sheet.
TattooXpert
AI illustrationFK Irons / Machines
FK Irons One Adjust · Stealth · two batteries
Technical reference.
A wireless pen with a 2–5 mm adjustable stroke and digital display for different setups on the same machine.
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Made for your studio
Artists who want to adjust stroke length without switching machines.
The FK One Adjust offers a selectable stroke from 2 to 5 mm. The reviewed Stealth package includes two rechargeable batteries and a dual-slot charger; its display shows output in volts or hertz. This profile links to the complete machine, not a separate battery or grip. Match the setting to your cartridges and working technique.
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Good to know
This is not the Flux Max or EXO. Battery life depends on use; advertised runtime is not our own test result. Check shipping charges, warranty and exact package contents. We have not tested it in a studio.