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Irrometer Tensiometer – 12 Inch Tube-0-100 Centibar scale. For field or container applications, install in soil for continuous readings. A sealed water-filled tube with a special vacuum gauge and porous tip, works upon the tensiometer principle. As water is drawn from the soil by the roots, a partial vacuum is created, and pressure is recorded on the gauge.â¢ Low readings indicate waterlogged soil that has inadequate root aeration.â¢ Middle readings indicate the need to start irrigation.â¢ High readings indicate very low levels of moisture inhibiting maximum plant growth.Measures the amount of water available in any soil type. (However, the LT series is especially designed for non-soil mixes.) With each initial order a service unit is required.For use in field applications. Replaceable ceramic tip. Gauge readings 0-100 centibar. Irrometer Tensiometer – 12 Inch Tube-0-100 Centibar scale