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Plant these specially-designed gypsum block sensors in the root zone of your plants without detracting from the visual appearance of your landscape. Require no water or vacuum gauge, which makes them maintenance free. Watermark sensor will not dissolve in the soil like other gypsum block sensors. Gives accurate readings, even with salinity levels found in agricultural crops and landscapes. Sensor includes 5'L cable. Wire leads: AWG 20, 2 leads.
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