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The A21REL-12 contains four internal relays that allow a Campbell Scientific datalogger to control up to four external ac or dc devices.

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Shipping Weights & Dims

Single Box Shipping Weight:
     2.0 lbs
      907 g

Single Box Shipping Dimensions:
      12" x 12" x 4"
      30.5 x 30.5 x 10.3 cm