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                    "text": "SMS\nADR",
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                    "text": "Short description\nADR uses an oscillator to generate an electromagnetic signal at a consistent frequency, which is transmitted through a central signal rod, using outer rods as an electrical shield. The electromagnetic signal is partially reflected by areas of the medium with different water content, producing a measurable voltage standing wave.",
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                    "text": "Photo",
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                    "text": "TDT",
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                    "text": "TDT measures the transmission of a pulse along a looped, or closed circuit, rod. TDT measures the time taken for an electromagnetic signal to travel along a given length of a transmission line in the soil. With TDT, a step pulse with a fast rise time is transmitted into a transmission line. The step pulse travels down the transmission line, and a voltage is detected at the other end of the transmission line. A pulse measured via TDT will be slower in wetter soils rather than drier soils.",
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                    "text": "Neutron probe",
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                    "text": "Neutron probe consists of a neutron source, detector, and an electronic counting scale. Measurements at desired depths are made by lowering the probe into an access tube installed vertically in the soil. This radioactive probe emits high-energy neutrons in all directions into the soil. When these neutrons collide with hydrogen atoms in the soil, the velocity of the neutron is attenuated or slowed down. The rate of attenuation is dependent on the amount of water present.",
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                    "text": "Wireless sensors",
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                    "text": "Wireless sensors are buried under the soil at the start of the growing season with the logo facing towards the sky. The sensors are located in the silver bands surrounding the device. Throughout the growing season, it sends data back to a phone application over a low power cellular data that can operate at significant distances from cellphone towers.",
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