Review of Fosc-21 (Focus Oscilloscopes) – a $20 USB Oscilloscope from ebay

Sometimes we make a bad spontaneous purchase. It must have happened to everyone at least once. This is the story of one such purchase. Without doing my research I clicked ‘buy’ on a really cheap Chinese USB oscilloscope from ebay – Focus Oscilloscopes 21 (Fosc-21). The crappy-ness of this “oscilloscope” is matched only by its […]