4000W 220V AC SCR Voltage Regulator Dimmer Electric Motor Speed Controller Thermostat

The 4000W 220V AC SCR Voltage Regulator Dimmer Electric Motor Speed Controller Thermostat seems to have mixed reviews from customers. One customer pointed out a lack of solder on the joints holding the potentiometer to the PCB, particularly one leg that had no solder at all. The customer expressed concern about the safety of the product, especially since it is a 220V item with an all-metal case and no earth connection. They had to solder the joints themselves and connect an earth to the outer cage to feel safer. The supplier acknowledged the issue, but stated that it wouldn't cause any safety concerns. Another customer was disappointed with the product, as they felt it only had two options for power reduction and would suddenly drop the power significantly, causing their device to stop working. On the other hand, a few customers had positive experiences with the product. One customer used it as a variable control for their coffee machine pump and found it to work well. Another customer used it to regulate the speed of dangerous tools like a radial saw and a column drill, and they recommended it for its safety features. There were also a few customers who praised the product for accurately matching the description and performing as expected. However, one customer mentioned that the delivery time was excessively long, taking over 40 days to arrive. Overall, there seem to be concerns about quality control and safety, but some customers have found the product useful for their specific needs.