3.7" usb digital oscilloscope *Digital oscilloscope *Bandwidth:20MHz Sample Rate ( Real time ):100MS/s USB ... Average DC gain accuracy ±3% Automatic Measurement Vpp,Vavg,RMS,Frequency,Period,Vmax,Vmin,Vtop,Vbase,Width,Overshoot ,Preshoot,Risetime,Falltime ... and testing HDS1022M-N Handheld oscilloscope 20MHz 3.7" usb digital oscilloscope