Features: Kits using ARM Cortex-M3 processor (STM32F103C8), and includes a 2.4-inch color TFT display can be used as ARM test development board. Available source, Capable people can be secondary development on the basis of the suite, for example, it can be changed to Millivoltmeter, data loggers, and so on (we don't supply any technical support about that). The circuit is simple and the kit is inexpensive    Description: PCB size: 117 x 76mm;  Screen size: 52 x 40mm;  Supply voltage: DC 9V;     Characteristics of indicators: Maximum real-time sampling rate: 1Msps;  Accuracy: 12Bit;  Sampling buffer depth: 1024 bytes;  Analog bandwidth: 0 - 200KHz;  Vertical Sensitivity: 10mV / Div - 5V / Div (1-2-5 progressive manner);  Adjustable vertical displacement, and with instructions;  Input impedance: 1MΩ;  Maximum input voltage: 50Vpp (1: 1 probe), 400Vpp (10: 1 probe);  Coupling modes: DC / AC / GND;  The horizontal time base range: 10μs / Div - 50s / Div (1-2-5 progressive manner);  With automatic, regular and one-shot mode, easy to capture the moment waveform;  Available rising or falling edge trigger;  Adjustable trigger level position, and with instructions;  Observable previous trigger waveform (negative delay);  Can freeze at any time waveform display (HOLD function);  Comes 1Hz /3.3V square wave test signal source.    Package included: 1 x DIY Digital Oscilloscope Kit;  1 x DSO138 Transparent Acrylic Sheet.