... Menu man-machine conversation .English or Chinese for choice .14.Display: LCD display, high-resolution graphic monitor presents two-dimensional pattern (impedance) ... and amplitude vectors.15.Double or single strip chart display on full screen of LCD16.Phase and amplitude auto- ... types: Differential, absolute, reflection, I.D, O.D.22.Display screen size:15" diagonal, magnetic deflection23.Sweep: A-sweep ...