EXO sensors have identical connectors and identify themselves via onboard firmware; therefore, users can install any probe into any universal sonde port. The exception is the wiper for the EXO2 sonde, which must be installed in the central Port 7. Individual ports are physically identified by an engraved number on the sonde bulkhead. Although the probes are wet-mateable, users should clean, lubricate, and dry the sonde and sensors connectors prior to installation or service, when possible.