Observable waveform before triggering (negative delay) Maximum real-time sampling rate: 1 Msps Equipped with a 1KHz/3.3V square wave test signal source Input impedance: 1M Adjustable vertical displacement with indication Packing List: 15001K (SMD components welded): Adjustable trigger level with indication The oscilloscope uses a 9V DC power supply (power should not exceed 10V! Otherwise, it may burn out the machine). The kit itself does not include a power supply, and users need to prepare their own power supply. The power supply should be able to provide more than 200mA. Save/recall waveform, power-off waveform does not disappear Precision: 12Bit Equipped with automatic, conventional, and free run trigger methods, convenient for capturing instantaneous waveforms Analog frequency bandwidth: 0-200KHz Coupling methods include DC/AC/GND Sampling buffer depth: 1024 bytes Digital display of waveform parameters, including frequency, period, pulse width, duty cycle, max value, min value, average value, peak-to-peak value, RMS value All parts of the oscilloscope, including the analog board assembly components, have been soldered and tested Waveform display can be frozen at any time (HOLD function) Maximum input voltage: 50Vpp (1:1 probe), 400Vpp (10:1 probe) Triggered by rising or falling edges Package includes: 1pc DSO Shell Oscilloscope