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The 16538 is a hardware modification that expands the CR10's program memory from 1978 to 4023 bytes. Available data storage is reduced by approximately 2 kbytes.
The CR10 must be returned to Campbell Scientific. Fee also includes a new PROM [LS17424], recalibration, full checkout, temperature testing, and manual.
The 16538 is for CR10 dataloggers with serial numbers less than 19272.