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The 25990 provides a rigid carrying case that holds both the gas analyzer and sonic anemometer. Please note that a foam insert is not included. Foam is required to transport the EC155. However, each EC155 is shipped in foam. Therefore, you will get the foam if the 25990 is ordered at the same time as the EC155.
Campbell Scientific recommends a carrying case if the EC155 will be transported frequently or stored in environments where impacts or external forces to the EC155 and its packing materials could occur.