Table 2.

Main characteristics and analytical performance of Setup 1 and Setup 2 proposed in the first section of the review.

Electrochemical Configurations	Quantitative Analysis	Qualitative Analysis	Main Advantages	Main Disadvantages
Setup1:	----------------------------	✓	easy sensor geometry for in situ manipulation	Stiff (not flexible) contact probe and the liquid conductive electrolytes provoke electrochemical contact problems toward the surface of cultural heritage, compromising the final electrochemical measurements
Setup2:	----------------------------	✓	Flexible cell geometries suitable for CH surfaces (with significant roughness) Solid conductive electrolytes to guarantee the electrochemical/electrical contact toward CH surfaces	The difficulty of processing the acquired experimental data by ECs, working with Nyquist plot

✓ Qualitative analysis is present in each electrochemical small-sensor prototype; --------------: this symbol means that the specific parameter is not reported in the paper.