Solder Ninja PEN
Meet the Solder Ninja Pen, the ultimate USB-powered soldering iron designed for reliability and precision. Compatible with Weller’s extensive RT Micro tip catalog, it’s versatile enough for tasks ranging from large ground planes to submillimeter microsoldering. With hot-swappable tips, an adjustable temperature display, and a lightweight design, the Solder Ninja Pen is ideal for both professionals and hobbyists looking for portability without compromising quality.

The Power of
USB Type-C
No internal battery, just pure flexibility. The Solder Ninja Pen draws power from almost anything: wall chargers, laptops, or even portable power banks. It automatically adapts to the available power source, supporting USB Power Delivery (PD) for up to 45 W, as well as Quick Charge™ and legacy 5 V modes
One Soldering Iron,
Many tips
Built around the proven Weller® RT Micro ecosystem, the Solder Ninja Pen gives you access to a vast catalog of precision tips; from ultra-fine to heavy-duty. They are widely available from major distributors and can also be found in our Accessories section, ensuring lasting compatibility and easy replacement.

Intuitive
user interface
A crisp OLED display and tactile buttons provide complete control right at your fingertips. Set and monitor temperature precisely, switch between left or right-handed layouts, and instantly see the power level negotiated with your power source, so you always know what’s driving your iron.
Heat-resistant
USB Type-C Silicone Cable
The included USB Type-C cable uses an heat-resistant silicone sheath. It's also flexible to keep the pen light in the hand and tangle-free on the bench, giving you total freedom of movement and precision during delicate soldering work.

- Enclosure: Anodized machined aluminum
- Microcontroller: Raspberry Pi RP2040
- Power: USB (BC, QC, PD) from 7.5 W to 45 W
- Temperature Range: 0-350 °C (400 °C boost)
- Heating Time: 5 seconds at 45 W (15 seconds at 15 W)
- Display: 0.69-inch monochrome 96 × 16 px OLED
- Interface: Configurable for right or left-handed use
- Buttons: Two buttons rated for 20,000 cycles
- Tip Connector: 3.5 mm jack from CUI rated for 5,000 cycles
- Power Connector: Würth Elektronik USB Type-C rated for 10,000 cycles
- Safety Features: Sleep on idle, sleep on magnet detected, lock on free fall
- Dimensions: 85 × 15 mm (160 × 15 mm with tip)
Documentation
Accessories
Online catalog of Weller® RT Micro tips
Spare USB Type-C silicone cables
Firmware
Default firmware is open source, releases can be found on the GitHub page.
Support for IronOS is coming, follow progress and contribute at https://github.com/Ralim/IronOS/issues/198.