This Yihua soldering iron's primary selling points are the digital display and low price. It works fine on 110v input. The digital display is on when the soldering iron is on. When the temperature is changed, the number changes and then after a brief moment it goes back to displaying the current temperature. I have used my previous Yihua soldering iron for over 4 years. It didn't have the digital display on the front so it would get left on sometimes for longer than it should. These Yihua soldering irons are priced comparatively low and have great performance. These are great soldering irons for beginners as well as more advanced peopple those who want more fine-tuned temperature control.
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Get your own here:
Yihua 937D Soldering Iron:
1.0mm Solder:
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Side note... Even though I don't fly it anymore, this X210 quad kit is still my favorite Racing Drone. You can use your new soldering iron to build it:
Detailed X210 Build Video: