It has couple of points where it measures the temps. One at the radiator to catch thermal runaway. And other thermocouple sits on the exhaust to measure hot air. It just doesn’t display the values of it.
Thermal runaway is managed by a fuse and it will cut the power if the radiator heats up to around 140C. Pic below shows 121.6C because I was a bit slow to take a picture. It stopped heating somewhere around 134C.
As far as review goes - it does it’s job. I don’t need to dry filament too often and I have alternative method that works pretty well and free. For the testing of this dryer I had a spool of petg sitting outside for a week in 100% humidity through the rains. In 6 hours there was a significant improvement in the filament moisture content.
There is a good fan installed that is choked by restricted airflow through the vents. A LOT. So if I would keep mine, I’d cut up the vents to increase airflow. Like every other slot would be removed.
Here is a couple of closeup videos from the testing we’ve done.