1. A maintenance information device for supplying information for condition-based maintenance of a technical system, comprising: a preferably ordinal sensor having a sensor element configured to monitor at least one load variable or wear variable of the technical system as an indicator of a maintenance-relevant condition of the system, the sensor being further configured to supply a preferably ordinal condition signal; an operating-scope-detection device configured to detect a cumulated scope of the operation of the system as a value of an operating scope parameter; an expected-value-supplying device configured to supply a degradation function which represents the expected degradation profile of the condition, which can be determined by means of the load variable or wear variable, as a function of the operating scope parameter; a remaining-service-life-determining device which is configured to: a) when at least one predetermined degree of degradation of the condition occurs, compare the current value reached for the operating scope parameter with the value of the operating scope parameter which is expected for this predetermined degree of degradation according to the expected degradation profile, and/or b) when at least one predetermined value of the operating scope parameter occurs, compare the current degree of degradation of the condition detected by means of the sensor with the value of the operating scope parameter which is expected according to the expected degradation profile given this degree of degradation; and due to the current value of the operating scope parameter in the case a) and of the degree of degradation in the case b) the remaining-service-life-determining device is configured to supply a recalibrated expected degradation profile of the condition plotted against the operating scope parameter; and a maintenance-recommendation-generating device configured to generate a maintenance recommendation for a future planning time period on the basis of the recalibrated expected degradation profile.