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 FK One Adjust
FK One Adjust is FK Irons' adjustable-stroke wireless machine, offering 2.0-5.0 mm stroke settings in 0.5 mm increments, drop-in battery power, and up to 12 hours of combined battery runtime in the manufacturer's current comparison data.
$799.99
Verified Jul 26 · FK IronsStroke: Adjustable 2.0-5.0 mm in 0.5 mm incrementsPower: Drop-in battery
Best for: Artists who want one wireless FK platform with broad mechanical stroke adjustment for lining, shading, and packing
Versatility99
Ergonomics87
Battery96
Control95
Value86
Advantages
Pros
- 2.0-5.0 mm adjustable stroke covers a wide range of techniques
- Drop-in battery system supports long-session battery rotation
- Single-machine flexibility can reduce the need to swap pens mid-session
Tradeoffs
Cons
- Heavier than several fixed-stroke wireless competitors
- Premium price
- No Bluetooth feature in FK's current machine comparison chart
Machine and workflow snapshot
Key specifications
Stroke
Adjustable 2.0-5.0 mm in 0.5 mm increments
Power
Drop-in battery
Runtime
Up to 12 hours combined battery runtime
Weight
249 g / 8.8 oz
Length
142 mm
Grip
33-38 mm ergonomic
Connectivity
No Bluetooth listed