-138 Kit:This kit uses ARM -M3 processor (STM32F103C8), and includes a 2.4-inch color TFT display screen, can be used as ARM test development board.Can be secondary development on the basis of this kit, for example, it can be changed to Millivoltmeter, data loggers. Adjustable vertical displacement, and with instructions.With automatic, regular and one-shot modes, easy to capture the moment waveform. Available rising or falling edge trigger.Observable previous trigger waveform (negative delay).Can freeze at any time waveform display (HOLD function). Comes 1Hz /3.3V square wave source.With waveform parameter digital display, including frequency, period, pulse width, duty ratio, MAX./MIN././-/virtual values. Waveform storage function: will not lose the waveform after power off. Short-circuit and open-circuit detection: can help the user find out the soldering error. TFT controller recognition function. The SMD has been soldered, more suitable for electronic beginner. Specifications: Maximum Real-time Sampling Rate: 1Msps Accuracy: 12Bit Sampling Buffer Depth: 1024 bytes Analog Bandwidth: 0-200KHz Vertical Sensitivity: 10mV / - 5V / (1-2-5 manner) Input Impedance: 1M Maximum Input Voltage: 50Vpp (1: 1 probe), 400Vpp (10: 1 probe) Coupling Modes: DC / AC / GND The Horizontal Time Base Range: 10s / - 50s / (1-2-5 manner) Supply Voltage: DC 9V Colour:Red+black Material:PCB+plastic Package Contents: 1 * DS138 DIY Digital Oscilloscope Kit 1 * Probe 1 * English Manual Only the above package content, other products are not included. Note: Light 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.