SainSmart Mini DSO203 Handheld Pocket-Sized Digital Storage Oscilloscope 4 Channels, 8MHz Analog Bandwidth, 72 MSps Sample Rate (DSO203-Plastic) Two 72Mhz analog channels and two digital channels. AD9288-40 dual A/D converter analogue channels from 36MS/s to 72MS/s. Signal Generator,Auto Measurement,Various Triggering Option. Easy waveform storage,Firmware upgrade,User applications,Open source. Built-in 8M USB disk.