AC Variable Speed Controller, 120V~220V 15A 4000W SCR Voltage Controller for Router Fan Electric Motor Rheostat

Bought this for use with a 240v griddle from the EU. The griddle has no temp control and 220v was too hot. Using this controller, we were able to adjust the voltage and thus the griddle temperature to just the right degree, which is about 185v for our task. I wasn't sure if this would work, but it works very well.

It works great I'm using it on my drill press which works excellent

I had some issues getting this working, the way I wanted it to. But working with the manufacturer I was satisfied with the solutions they provided.

Got this and was surprised at how lightweight it is. Weight-wise, it feels like the controller is empty, and feels like it was made very cheaply. Was skeptical, but plugged it in to run a large shop fan. This fan has 2 speeds - tropical force and hurricane force winds! Works well for outside and a large shop, but we wanted to use it indoors when doing repairs around the house as well. Hooked this controller up, and it definitely slows the fan speed down. The fan doesn't even start to work until the dial on the controller is at about 60% (less than that the fan does nothing), and goes up from there. When using the controller the fan speed never gets to full speed, even at 100%. Not a problem because if we want the fan to run at full speed, we just unplug the controller, and use the fan as-is. We wish the speed control was better at controlling the fan between 0-100%, but at least it does make the fan usable indoors, whereas it wasn't before. With the build quality, I'm not really sure how long it will last, but time will tell.

Didn't work from the get-go. No matter where the dial is set, the output voltage is always the same as input. I didn't have high hopes due to the low price anyway. Returned to Amazon for refund.