FK Irons ONE Adjust

Master Every Style. Never Break Your Flow.

The FK Irons ONE Adjust puts true, unparalleled versatility directly in your hands. Engineered with a revolutionary, patent-pending stroke adjustment system, this is the one machine that can effortlessly conquer every technique—from delicate fine lines to saturated color packing—without ever slowing you down.

Tired of swapping machines mid-session? The ONE Adjust lets you dial in the perfect stroke on the fly, keeping your focus where it belongs: on the art. Built with FK Irons' renowned power and consistent hard-hitting performance, this machine is your all-in-one game-changer.

Instant Versatility: The Adjustable Stroke Advantage

The core innovation is a simple, intuitive adjustment ring that transforms your machine in seconds.

✯ Wide Stroke Range: Seamlessly adjust your stroke from 2.0mm up to 5.0mm, in precise 0.5 mm increments.

✯ On-The-Fly Changes: Change your stroke mid-session without powering down—the ultimate workflow accelerator.

✯ One Machine Does It All: Transition instantly from smooth black and gray shading to bold, single-pass lining.

Wireless Freedom. Non-Stop Power.

The ONE Adjust is built for the marathon session, offering a dependable wireless experience right out of the box, and built with everything you need to finish strong.

✯ Dual Swap-and-Go Batteries: Includes two rechargeable Panasonic batteries (short 18500A and long 18650A) for up to 12+ hours of total runtime. Easily swap batteries in seconds with the quick twist battery hatch to maintain non-stop performance. Always keep a spare battery charged, with the included dual-slot charger, and ready to drop in.

✯ Ambidextrous Screen: Digital display can be configured for both right- and left-handed artists. View your power output in Volts (5 - 12 V) or Hertz for the most accurate measure of needle frequency and speed.

✯ Precise Adjustments: Fine-tune your voltage with 0.2 V (or 10 Hz) increments.

✯ Refined Ergonomics and Aerospace-Grade Construction: Designed for a comfortable, balanced feel to minimize hand and wrist fatigue during long sessions. Built with the highest-quality materials for professional reliability and durability. 

✯ Modular Compatibility: Works seamlessly with all FK Irons modular grips, including ErgoShield Disposable Grips for fast, sterile setups.

This item includes free standard shipping within the contiguous United States.

Specifications

Length: 143 mm / 152mm
Weight:
     - 216 g / 7.6 oz without battery
     - 248 g / 8.7 oz with 18500A battery
     - 266 g / 9.4 oz with 18650A battery
Voltage range: 5 to 12 V (adjustable by 0.2 V)
Hertz range: 80 to 180 Hz (adjustable by 10 Hz)
Stroke: 2.0 mm to 5.0 mm, adjustable in increments of 0.5 mm
Battery run-times:
     - 18500A (Short): Up to 5.5 hours*
     - 18650A (Long): Up to 6.5 hours*
Material: 6061 T6 Aluminum
2-Year Manufacturer Warranty
* Battery life varies based on voltage, stroke, and operating parameters. Individual experiences will vary.

Package Contents
1 x FK Irons ONE Adjust Machine
1 x Rechargeable Panasonic 18500A battery
1 x Rechargeable Panasonic 18650A battery
1 x Short battery end cap (for 18500A)
1 x Long battery end cap (for 18650A)
1 x Dual Battery charging dock
1 x USB-C Charging cable
1 x Premium travel case with custom-cut protective foam

* All sales are final for this item. Warranty service for this item provided directly by the manufacturer.