... USB developed by our company. is a portable PC-based Digital Oscilloscope.High performanceDSO-2090 USB has the following features: 40MHz ... range 10mV ~ 5V/div @ x1 probe(10mV, 20mV, 50mV, 100mV, 200mV, 500mV, 1V, 2V, 5V/div1,2,5 sequence) 100mV ~ 50V ... increments 0.02 div Impedance 1M ohm DC accuracy +/-3% Input protection 35Vpk (DC + peak AC < 10 kHz, without external attenuation) Display ...