We like the placement of the temperature sensor on this iron. It’s is located in the center of the iron and fits into a recess at the back of the tip. This setup gives a more accurate reading of the actual tip temperature than many cheaper soldering pencils.
The temperature sensor is a k-type thermocouple, which the soldering iron driver board supports. The driver is designed to offer a lot more options then the original Weller WES51 station, at a fraction of the cost.
Right now the pencil is somewhere in a mailbag making its way to us. We’ll provide a more comprehensive review once it arrives.