In this video Dumitruv demonstrates his Unisolder 5.2 designed by Sparkybg:
First part is the calibration with a precise 10 Ohm resistor then I plug the iron and you can see the temperature stabilizing after quite awhile. Once it stabilizes I touch the wet sponge and it goes out of whack again.
Via the project log forum.

When I try to access the site I receive the following message:
“Not Found
The requested URL /forum/viewtopic.php was not found on this server.”
Thanks for the heads up! I updated the forum and forgot to redirect to the new urls. This should be somewhat fixed now.