## 4 Discussion and Conclusions
The various infusion devices have different delivery mechanisms and therefore different characteristics in terms of response, delay and stability time, sensitivity, flow rate stability, accuracy, precision, etc. In addition, the associated accessories (fittings, tubes) can also have an influence on the flow rate (dead volume, compliance and push-out effects). The infrastructure for carrying out such investigations and calibrations based on the available standards is now in place and can also be adapted to future standards if required. Another special feature of the two test facilities is that it is not only possible to measure with distilled or ultra-pure and degassed water as the measuring medium, as specified in most standards, but also liquids other than water (non-toxic liquids). If the infusion solution used is a Newtonian liquid, it is possible to measure the dynamic viscosity in addition to the flow rate. The option and combination of measuring dynamic flows and different measurement liquids makes the equipment also interesting for measurements outside the medical sector. There are other areas of work mostly in analytical laboratories, such as HPLC applications, biomedical and environmental applications, but also various industries, such as the chemical industry, semiconductor industry, food and pharmaceutical industry that use flow devices that operate in the micro and nano flow rate range. In this context, flow meters, especially thermal mass flow meters and Coriolis flow meters, which are frequently used in these areas, should be emphasised. With the newly created infrastructure, it is possible to test these devices statically and dynamically over a wide flow rate range, often even with the medium used later in the application. Conceptualisation, O.B. and K.S. ; methodology, O.B. and K.S. ; software, O.B. ; formal analysis, O.B. ; investigation, O.B. and K.S. ; supervision, O.B. ; writing--original draft preparation, O.B. ; visualisation, O.B. ; writing--review and editing, K.S. All authors have read and agreed to the published version of the manuscript. The authors greatly acknowledge the financial support of Vinnova (Sweden's Innovation Agency) project 2014-05078 as a basis for this work. This work was supported by the European Association of National Metrology Institutes (EURAMET) through the European Metrology Programme for Innovation and Research (EMPIR) Joint Research Project (JRP) 18 HLT08 Metrology for Drug Delivery (MeDDII). The EMPIR initiative is co-funded by the European Union's Horizon 2020 research and innovation programme and the EMPIR Participating States. Not applicable. The data presented in this study are available on request from the corresponding author. The data is not publicly available due to the amount of data and the specific type of storage. The authors declare no conflict of interest. The following abbreviations are used in this manuscript:  
AAMI Association for the Advancement of Medical Instrumentation  
CAS Chemical Abstract Service  
CFM Coriolis Flow Meter  
CSV Comma-Separated Values  
DAQ Data Acquisition  
DDE Dynamic Data Exchange  
DUT Device Under Test  
ECRI Emergency Care Research Institute