Review on ⚡ Beleeb 5 Amp Auto AC Variable Voltage Regulator - Max 500VAC, 120VAC Input, 0-120V/130VAC Output by Clete Dean

Robust, infinitely adjustable switch and socket of good quality and large capacity. Excellent value for money and quality. Note that the voltages printed above assume an input voltage of 110V. In my house it's closer to 126v, so setting the knob to 110 gives 126v! Bottom line: don't rely on the label. The meter on the front is pretty close, but it only reads a few specific voltages, so I'd recommend using a meter to check what you're getting. My solution as shown in the picture was to use a voltmeter to make adjustments. Output to specific values I need and then print a label for those values. It works great and is very reproducible.