WHY THIS $2 Aliexpress Module IS EFFECTIVE?

Support electronics and my work :https://ko-fi.com/hacktuber The links below are affiliate links, but that will not affect the normal price. If you buy something I get a few cents towards for buying more gadgets and modules for us to explore and test,thank you. PWM DC motor speed controller 5A 90W dc input voltage 4.5-35v. Aliexpress link:https://s.click.aliexpress.com/e/_Evq7aas Multimeter used in video: ZOYI-ZT703s 3in1 oscilloscope,multimeter,signal generator:https://s.click.aliexpress.com/e/_EvHdtMg 5pcs 4mm stackable banana plug to aligator clip multimeter cables. Aliexpress link:https://s.click.aliexpress.com/e/_EQ4qKc8 Folding Digital Electronic Microscope Autofocus with 8leds 500X Zoom Magnifying 2Inch Screen for Coin Microscopio Windows/Mac. Aliexpress links:https://s.click.aliexpress.com/e/_EGAcVoc https://s.click.aliexpress.com/e/_EIWMtU8 XY6008 DC regulated power supply step down module CNC Adjustable DC stabilised power constant voltage constant current.60V 8A 480W Aliexpress link:https://s.click.aliexpress.com/e/_EHl0WLi https://s.click.aliexpress.com/e/_EGlXKEw full video review:https://youtu.be/vlLCOjiGzeU