Turn On/Off Readoutspress [SEL] so that timebase is highighted. Hold down [OK] button for about 2seconds. This will turn on/off measurement readouts.Waveform Save/RecallPress [SEL] & [+] simultaneously: Save currently displayed waveform to non-volatile memory.Press [SEL] & [+] simultaneously: Recall saved waveformTriggers and Their ModesTriggers are events that indicate signal voltage acrossing a set level (i.e. trigger level) along a specified direction (i.e. trigger slope, rising or falling). Oscilloscope uses triggers as reference points in time for stable waveform display and measurements.Auto ModeIn auto mode oscilloscope will perform display refresh no matter triggers happen or not. When triggers are detected waveform display will be displayed with reference to trigger points.Otherwise, display waveform at ramdom reference points.Normal ModeIn normal mode oscilloscope will only oerform display refresh when there are triggers. If no triggers happen waveform display will stay unchanged.Single ModeSingle mode is the same as normal mode except that oscilloscope will enter HOLD state after a trigger has been detected and waveform display has been updated.Normal and single modes are useful for capturing sparse or single waveform.SpecificationsMax realtime sample rate 1Msa/sAnalog bandwidth 0--200KHzSensitivity range 10mV/div~5V/divMax input voltage 50Vpk(1X probe)Input impedance 1M ohm/20pFResolution 12 bitsRecord length 1024 pointsTimebase range 500s/Div``10us/DivTrigger modes Auto,Normal,and SingleTrigger position range 50%Power supply 9V DC (8~12V)Current consumption ~120mADimension 117X76X15mmWeight 70gram(without probe)