The transmission and echo conversion process continues for as long as the Send button remains pressed. You can, therefore, pan around a room and just generally view its dimensions until you are ready to accept a measurement. At this moment, releasing the switch will cause the last measurement read to stay on the LCD screen. It will remain there until Send is pressed again, or Recall switch is pressed, or the unit is switched off.While Send is pressed, the sampling rate is normally a little under once
per second depending on the mask and distance values.