Analog tonometer TEN30 principle 
 When the soil dries, the first contact with the ceramic surface tension of the situation and humidity tends to be sucked out of the water inside the tube thus formed in the pipe at the top of a partial vacuum, when irrigation or rainfall, the water being sucked back to the vacuum tube to decrease. By vacuum suction into account the soil water potential and intuitive. 

 Analog tonometer TEN30 advantages: 
 Inexpensive instrument without calibration and maintenance can be zero only a few years of reliable use weather-resistant polycarbonate probe, high strength, long life of the components can be removed for easy replacement of maintenance 

 Analog tonometer TEN30 main components: 
 Analog meter tensiometer suction pipe negative pressure meter pointer can be replaced by another pressure sensor, water potential of the direct output signal for easy connection to data acquisition. 
 Analog tonometer basic technical indicators: 

 Standard Length :15-120 cm (can be customized) 
 Standard length refers to the middle of a transparent polycarbonate tube tensiometer suction pipe length 

 Measuring range: 1Bar (1Bar = 100KPa)