This kit uses ARM -M3 processor, 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. 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). This -138 digital oscilloscope kit adopts ARM -M3 processor and with 2.4-inch TFT screen. It's easy and reliable for circuit operation. It can display frequency, period, duty ratio, MAX./MIN././-/virtual values. Can freeze at any time waveform display (HOLD function). Comes 1Hz /3.3V square wave source. With waveform parameter digital display, including frequency, period, duty ratio, MAX./MIN././-/virtual values. Short-circuit and open-circuit detection: can help the user find out the soldering error. TFT controller recognition function. Colour:Transparent Material:Acrylic Package Contents: 1set * digital oscilloscope kit (with case, shipped in parts) 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.