Oscilloscope for up to 6 input signals.
Horizontal scale is defined by the scale knob and the scale switch: HIGH - between 5 and 126 ms for the full screen MEDIUM - between 126 and 5045 ms for the full screen LOW - between 5045 and 196772 ms for the full screen
The knob above the input jack sets the vertical scale. Button below the input jack decides when to trigger a redraw (+ means redraw when the signal switch from negative to positive, - means redraw when the signal switch from positive to negative). If no trigger button is checked it redraws continuously.
The STOP / RUN button allows you to freeze the oscilloscope.