A method of storing data related to an installation process, service process or performance of a measurement instrument, the method being performed by a mobile device and comprising: interrogating the measurement instrument using near field communication; receiving, in response to the interrogation, reference data from the measurement instrument for identifying the measurement instrument; capturing data related to the installation process, service process or performance of the measurement instrument; and storing the captured data using or in association with the reference data in a data storage device (18; 44; 52); wherein capturing the data related to the installation process, service process or performance of the measurement instrument comprises one or more of the following: taking a photograph or a video clip, or recording audio; capturing data relating to the physical position of the measurement instrument or of a port of the measurement instrument; capturing the geolocation of the measurement instrument or its port using location determining means of the mobile device; capturing the compass bearing of the measurement instrument or its port, or the inclination of the measurement instrument or its port, using one or more sensors (42; 40) of the mobile device; receiving text or diagrams inputted or selected using the mobile device; capturing data relating to operational characteristics of the measurement instrument via one or more sensors of the mobile device, wherein the operational characteristics of the measurement instrument comprise one or more of vibration levels detected via said sensor(s) of the mobile device, and/or noise levels detected by an audio input of the mobile device. interrogating the measurement instrument using near field communication; receiving, in response to the interrogation, reference data from the measurement instrument for identifying the measurement instrument; capturing data related to the installation process, service process or performance of the measurement instrument; and storing the captured data using or in association with the reference data in a data storage device (18; 44; 52); wherein capturing the data related to the installation process, service process or performance of the measurement instrument comprises one or more of the following: taking a photograph or a video clip, or recording audio; capturing data relating to the physical position of the measurement instrument or of a port of the measurement instrument; capturing the geolocation of the measurement instrument or its port using location determining means of the mobile device; capturing the compass bearing of the measurement instrument or its port, or the inclination of the measurement instrument or its port, using one or more sensors (42; 40) of the mobile device; receiving text or diagrams inputted or selected using the mobile device; capturing data relating to operational characteristics of the measurement instrument via one or more sensors of the mobile device, wherein the operational characteristics of the measurement instrument comprise one or more of vibration levels detected via said sensor(s) of the mobile device, and/or noise levels detected by an audio input of the mobile device. taking a photograph or a video clip, or recording audio; capturing data relating to the physical position of the measurement instrument or of a port of the measurement instrument; capturing the geolocation of the measurement instrument or its port using location determining means of the mobile device; capturing the compass bearing of the measurement instrument or its port, or the inclination of the measurement instrument or its port, using one or more sensors (42; 40) of the mobile device; receiving text or diagrams inputted or selected using the mobile device; capturing data relating to operational characteristics of the measurement instrument via one or more sensors of the mobile device, wherein the operational characteristics of the measurement instrument comprise one or more of vibration levels detected via said sensor(s) of the mobile device, and/or noise levels detected by an audio input of the mobile device.