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The 21838, manufactured by Sentek, provides a 0.5 m EnviroSCAN probe without the clip-on sensors or seals. It consists of an SEN20510 1 m Access Tube, a 0.5 m probe rod, SEN22400 Top Cap Assembly, and a handle set with screws. Up to five click-on water-content sensors can be added. Each sensor measures water content at one position on the probe; one sensor per measurement depth is required.