Features: With automatic, conventional and single trigger mode, easy to capture the instantaneous waveform. Can be triggered by rising or falling edges. The trigger level is adjustable and with indication. Waveforms before observable triggering (Negative delay). Can freeze waveform display (HOLD function) at any time. Descriptions: Square wave test signal source with 1KHz /3.3V. With waveform parameter digital display, the parameters can be displayed: frequency, cycle, pulse width, duty cycle, maximum, minimum, average, peak, rms. Save/bring out the waveform, turn off the waveform does not disappear. Specifications: Model: DSO138 Material: Acrylic, metal Color: red & black, transparent Size: 128*88*27mm Highest real-time sampling rate: 1Msps Accuracy: 12Bit Depth of sample buffer: 1024 bytes Analog bandwidth: 0-200KHz Vertical sensitivity: 10mV/Div – 5V/Div (progressive by 1-2-5) The vertical displacement is adjustable with indication Input impedance: 1M ohm Maximum input voltage: 50Vpp (1:1 probe), 400Vpp (1