Graphical material

An overview of the image sources used:

Proficiency testing as a gearwheel of quality assurance source: EtiAmmos/Shutterstock.com

Tensile testing machine for material testing source: istock.com/pamirc

Various foods (fish, nuts, fruits and vegetables) on a wooden table source: margouillat photo/Shutterstock.com

Petri dish with growing cultures of microorganisms and moulds source: luchschenF/Shutterstock.com

Various commodities in a basket (shampoo, toothbrush, toys) source: shutterstock.com/de/g/279photo

Modern and clean testing laboratory for proficiency testing source: i3d/Shutterstock.com

Sterile medical devices in a drawer source: unsplash.com/photos/pV5arhEZHiA

source: istock.com/bluejayphoto