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Campbell Scientific removed the SDM1502 from our pricing system on April 17, 2008. The SDM1502 provided an SDM interface for our data loggers in a 1502B-based or 1502CCS-based TDR system. The 1502B and 1502CCS cable testers were replaced with our TDR100 reflectometer. TDR100-based systems use the SDMX50-series multiplexers instead of the SDM1502, and therefore the SDM1502 was retired.