◎　Main Characteristics:
　　After turning on, automatic set zero.
　　Being able to automaticly track the timing of starting point of the lower liquid position.
　　With the preset switches for measuring number of times.
　　With more measuring buttons of manual starting and stopping.
　　After reaching measuring number of times, the buzzer alarms.
　　System malfunction alarm prompt.
　　Automatic zero cleaning upon being energized
　　Automatic tracking the lower liquid level taken as starting point of time metering.
　　Being provided with a present valve for determining number.
　　Beling provided with buttons for manual turn-on, manual turn-off and re-testing.