AC Motor Speed Controller,100V~120V 15A 4000W Fan Variable Speed Controller with Overload Protection,Electric Motor Voltage Regulator for Router Rheostat Fan

Works exactly as advertised. Very good motor controller and temperature controller.

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.

For what it does this is an excellent value. Also, the first one I ordered was damaged in shipment and was replaced without any problem.

I suppose that just purchasing a variable speed bench grinder in the first place is the better option. However, since mine is set up with the wheels I want and mounted with appropriate measurements for woodturning tools I sharpen, this speed controller is a good addition. At about half the dial the voltage gets so low that the grinder shuts off, but about mid range the RPM is slowed enough for sharpening and reduction of the heat build-up for my tools. Cheaper options for a controller just don't work at all.

Got this a few months ago and would only in the top 15% range, which is where I use it. So, I didn't complain... now after using about 4 times it has completely stopped working and will not even turn on. Unfortunately I've had a poor experience with this product.

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.

I have two Westinghouse table fans from the 1950s. They move a lot of air but they tend to be a bit noisy. When I want a lot of moving air or I want white noise for a sleep, those fans are great. For TV I want much less airflow and much less noise. This controller works perfectly to slow the fan, reduce the air and cut the noise dramatically. I can use the ON/OFF switch without changing the speed setting and the fan returns to the preset speed from the night before. That's just what I wanted.The watt meter on the controller does not show what wattage of this fan. I don't know why and I really don't care. The controller does what I want it to do.

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.