Professional equipment specifications can change. Data below was checked against the linked manufacturer source on 2026-07-25. ComparePilot does not provide medical or infection-treatment advice.
Tattoo Machines
FK Irons ONE Update
FK One Update is a wireless pen platform with a digital display, 0.2V voltage adjustments, removable battery power, and 3.0 mm or 4.0 mm fixed-stroke configurations. FK currently offers it in Stealth, Gunmetal, and Pop Pink.
$649.99
Verified Jul 26 · FK IronsStroke: 3.0 mm or 4.0 mm fixedMotor: Brushed coreless motor
Best for: Artists who want a simpler FK wireless pen with digital visibility, long battery life, and a choice of 3.0 mm or 4.0 mm fixed stroke
Versatility91
Ergonomics91
Battery98
Control91
Value89
Advantages
Pros
- Up to 12 hours of advertised battery life
- Digital display and fine 0.2V adjustment steps
- 3.0 mm and 4.0 mm configurations cover different lining, shading, and packing preferences
Tradeoffs
Cons
- Fixed stroke
- Fewer ecosystem features than FK's flagship Flux Max
- Battery life varies with voltage, cartridge load, and working style
Machine and workflow snapshot
Key specifications
Stroke
3.0 mm or 4.0 mm fixed
Motor
Brushed coreless motor
Runtime
Up to 12 hours combined battery runtime; individual battery runtime varies
Display
Digital display
Voltage
0.2V adjustment increments
Battery
Removable rechargeable battery cell
Grip
Click-grip ratchet needle-depth adjustment
Compatibility
Standard tattoo needle cartridges
Colors
Stealth, Gunmetal, Pop Pink