FK One Adjust Wireless Tattoo Machine - Pick Color

Built to Adapt, Engineered to Perform

Tattoo without limits using the FK One Adjust. Built to handle any style or technique, this machine lets you adjust your stroke on the fly—no need to power down, swap machines, or change cams mid-session. One setup does it all, and it’s all right there for you. 

Get all-day wireless performance with two swap-and-go rechargeable batteries. The large battery delivers up to 6.5 hours of runtime, and the small battery up to 5.5 hours, depending on your settings. A dual-slot charger keeps one battery ready while you work. 

The upgraded digital display gives you a clear readout of your voltage or hertz—your choice. Hertz provide a more accurate view of your machine’s performance, showing needle frequency per second. 

Designed with artists in mind, the FK One Adjust is reliable, durable, and built to last. It’s artist-tested and made specifically to handle whatever you throw at it and meet your daily needs in the shop. Backed by FK’s global service program, FK One Adjust keeps up with you—session after session. 

The FK One Adjust runs on a custom-built engine made for steady, reliable performance. A fixed-stroke cam connects to a paddle, and a rotating slider changes stroke length by moving closer to or farther from the paddle’s center. This setup reduces friction, limits wear, and ensures a powerful performance every time.

A first-of-its-kind design made to keep your sessions smooth and your results consistent.

HOW THE STROKE ADJUSTMENT WORKS

The FK One Adjust features an innovative custom engine that redefines adaptability. A fixed-stroke cam connects to a precision paddle, while a rotating slider adjusts stroke length by moving closer to or farther from the paddle’s center. This design reduces friction and wear, keeping performance consistent session after session.

A first-of-its-kind system built to keep your flow uninterrupted and your performance unmatched.

• Machine Size: 152mm x 38mm
• Weight with Battery: 244g (8.6oz) w/ 18500A Battery / 268g (9.5oz) w/ 18650A Battery
• Features patent-pending adjustable stroke technology (adjust your stroke without powering down)
• Upgraded digital display screen: shows power output in volts or hertz according to your preference
• Stroke Range: 2.0mm up to 5.0mm
• Equipped with an ergonomic grip for maximum comfort
• Compatible with other FK Irons modular grips
• Features a brushed motor
• Output Voltage: 5V–12V
• Increment/Decrement Voltage Interval: 0.5V or 0.2V
• Maximum Output Current: 1A
• Comes with two drop-in, rechargeable Panasonic batteries + 2 caps
• 18500A Battery Life: ~5.5 Hours (dependent on settings + operating parameters)
• 18650 Battery Life: ~6.5 Hours (dependent on settings + operating parameters)
• 18500A Battery uses shorter cap → 0.25” depth
• 18650A Battery uses longer cap → 0.75" depth 

Resources:
User Manual

International User Manual