There's a lot to like about this soldering pencil, and a number of things that are a disappointment.
First off, I'm using this pencil exclusively to install hot set brass inserts in 3D printed objects. Temperature is set to 240°. Did not calibrate.
THE GOOD:
• Temperature control with readout. Easily visible numbers.
• Simple temperature setting (2 buttons). Remembers last temp setting
• 3-prong plug that actually grounds the tip (good for working on static sensitive electronic parts)
• Quick heating and recovery (didn't time warm-up, but seems close to claim of 10 sec.)
• Works very well out of the box for inserting hot set inserts.
THE NOT SO GOOD
• Instructions printed on back of the box, which you are likely to toss unless you cut it out. How about a printed sheet, clearly translated?
• Instructions, especially "calibration," are difficult to follow. Calibration info makes up 80% of the operating instructions. You should not have to calibrate the product. Who has a thermometer that goes to 320°C, anyway?
• Haven't tried the included solder. The sponge for tip cleaning is about half the size of a postage stamp and easily lost.
• One video shows a nice plastic case and printed instructions. Product comes with neither.
Complaints aside, the pragmatic approach for installing inserts is to try it. If the pencil heats too quickly or two slowly, adjust the temperature setting. Price-wise, it's OK.
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