1,This kit uses ARM Cortex-M3 processor (STM32F103C8), and includes a 2.4-inch color TFT display screen, can be used as ARM test development board. 2,Can be secondary development on the basis of this kit, for example, it can be changed to Millivoltmeter, data loggers. 3,Adjustable vertical displacement, and with instructions. 4,With automatic, regular and one-shot modes, easy to capture the moment waveform. 5,Available rising or falling edge trigger. 6,Observable previous trigger waveform (negative delay). 7,Can freeze at any time waveform display (HOLD function). 8,Comes 1Hz /3.3V square wave test signal source. 9,With waveform parameter digital display, including frequency, period, pulse width, duty ratio, MAX./MIN./AVG./Peak-Peak/virtual values. 10,Waveform storage function: will not lose the waveform after power off. 11,Short-circuit and open-circuit detection: can help the user find out the soldering error. 12,TFT controller recognition function. 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) Input Impedance: 1Mohm Maximum Input Voltage: 50Vpp (1: 1 probe), 400Vpp (10: 1 probe) Coupling Modes: DC / AC / GND The Horizontal Time Base Range: 10s / Div - 50s / Div (1-2-5 progressive manner) Supply Voltage: DC 9V PCB Size: 117 x 76mm / 4.6 x 3in Screen Size: 52 x 40mm / 2 x 1.57in Colour:red Material:PCB+Metal Package Contents: 1 x DSO138 oscilloscope (including housing) 1 x signal line 1 x User Manual(English) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.