3.7" usb digital oscilloscope *Digital oscilloscope *Bandwidth:20MHz Sample Rate ( Real time ):100MS/s USB oscilloscope replaceable Li-ion battery back ... attenuation factor 1X,10X,100X,1000X Input coupling DC, AC, GND DC accuracy(Average) Average>16:±(5% reading+0.05div ... screen center Acquisition modes Sample, Peak Detect and Average DC gain accuracy ±3% Automatic Measurement Vpp,Vavg,RMS,Frequency ...