Condition monitoring system including a network of distributed devices to be monitored, at least one portable communication device and at least one central control server , wherein each of the devices is provided with: a. at least one sensor for measuring condition data of the device , b. a monitoring unit for receiving and processing the condition data from the at least one sensor , c. a communication link between the monitoring unit and the central control server , wherein: - the monitoring unit is configured to send the processed condition data of the device to the central control server in combination with identification data for identifying the device; and - the central control server is configured to store the condition data in combination said identification data, - the monitoring unit is equipped with a communication interface for connecting the portable communication device to the monitoring unit , wherein - the monitoring unit is configured to automatically provide updated condition data to the portable communication device upon establishment of the connection to the monitoring unit and wherein - service information used and displayed on said portable communication device is created or updated based on the updated condition data characterized in that - the service information includes a service schedule or a checklist. a. at least one sensor for measuring condition data of the device , b. a monitoring unit for receiving and processing the condition data from the at least one sensor , c. a communication link between the monitoring unit and the central control server , wherein: - the monitoring unit is configured to send the processed condition data of the device to the central control server in combination with identification data for identifying the device; and - the central control server is configured to store the condition data in combination said identification data, - the monitoring unit is equipped with a communication interface for connecting the portable communication device to the monitoring unit , wherein - the monitoring unit is configured to automatically provide updated condition data to the portable communication device upon establishment of the connection to the monitoring unit and wherein - service information used and displayed on said portable communication device is created or updated based on the updated condition data characterized in that - the service information includes a service schedule or a checklist. - the monitoring unit is configured to send the processed condition data of the device to the central control server in combination with identification data for identifying the device; and - the central control server is configured to store the condition data in combination said identification data, - the monitoring unit is equipped with a communication interface for connecting the portable communication device to the monitoring unit , wherein - the monitoring unit is configured to automatically provide updated condition data to the portable communication device upon establishment of the connection to the monitoring unit and wherein - service information used and displayed on said portable communication device is created or updated based on the updated condition data characterized in that - the service information includes a service schedule or a checklist. <EOS>