brand new and high quality Features: DSO138mini brings in the following improvements: 1.Better structure and smaller size 2.USB or battery powered. 3.External trigger input. 4.Serial output of waveform data. 5.General controller. DSO138mini makeMCU and LCD stay in one PCBto avoid problematic pin-header connections that was used in DSO138. This not only increase product reliability but also allow the main board tobecome a flexible general purpose controller. DSO138mini'strigger can work reliably under 10us and 20us timebase settings.Waveform data can be outputted through serial port and the data can be easily displayed on PC with help of other software like Gnuplot.Thisphotoshows the same waveform displayed on PC using Gnuplot. Specification: Major features of DSO138 Analog bandwidth: 0 - 200KHz Sampling rate: 1Msps max Sensitivity: 10mV/Div - 5V/Div Sensitivity error: < 5% Vertical resolution: 12-bit Timebase: 10us/Div - 500s/Div Record length: 1024 points Built-in 1KHz/3.3V test signal Waveform for frozen (HOLD) function available Save/recall waveform Serial waveform data output Vertical Number of Channel: 1 Analog Bandwidth: 0 - 200KHz Sensitivity: 10mV/Div - 5V/Div Sensitivity error: < 5% Resolution: 12-bit Input Impedance: 1M ohm Maximum Input voltage: 50Vpk Coupling: for DC, AC, GND Horizontal Max Real-time Sampling Rate: 1Msps Timebase: 10us/Div - 500s/Div Record Length: 1024 Trigger Trigger Modes: Auto, Normal, Single Trigger Types: Rising/falling edge Trigger Position: 1/2 of buffer size fixed Display 2.4-inch color TFT LCD with 320 x 240 resolution Power Supply 3.5V - 6V for DC Supply Current: 120mA@5V Physical Dimensions: 7x8cm/2.76x3.15inch Main Color: Red Note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! 3.DSO138mini Digital Oscilloscope Kit only, other accessories demo in the picture is not included!No acrylic for shell. Package include: 1 set of DSO138mini oscilloscope kit