arduino oscilloscope VS DSO-138 KIT oscilloscope! HD

arduino oscilloscope VS cheap DSO-138 KIT oscilloscope. buy the DSO 138 kit : www.banggood.com/DSO138-DIY-Digital-Oscilloscope-Kit-SMD-Soldered-13803K-Version-p-984002.html?rmmds=search5D06058871339201702S buy the arduino mini: www.banggood.com/ATmega328P-Arduino-Compatible-Nano-V3-Improved-Version-No-Cable-p-959231.html?rmmds=search5D06058871339201702S PWM circuit: https://www.youtube.com/watch?v=wtzIyhlA3eQ arduino oscilloscope by Tech Inventor Aman: https://www.youtube.com/watch?v=44XWCoWICEg