DSO138mini has similar performance as DSO138 but came with significant improvements in power supply and mechanical structure.
Better structure and smaller size. The bulky pin-headers connecting the LCD and main board in old DSO138 has been eliminated. The soldering of these pin-headers has being found problematic for beginners.
USB or battery powered. This makes the scope much more convenient to be used as a portable device. New version analog board (PN: 109-13801-00H, aka “H version”) can accommodate a battery charger JYE118 (see here) to make the device more practical.
External trigger input. This input can accept a TTL or LVTTL signal as trigger source.
Serial output of waveform data. Captured data can be saved and displayed by PC. Here’s an example of a captured single byte (0x35) sent from a serial port at 115200bps and the same waveform displayed on PC using Gnuplot.
General controller. The main board can be used as a general purpose control board with LCD display. MCU ports were brought to board edges for easy connection to target system.