Table 2. Method comparison with respect to precision, detection limit and applicability.

Exp.	Method	Precision	Meas. Freq.	Pot. Det. Lim.	Fragility	Handling	Price
1	STOX	+++	++	+++	+	++	+
1	Optode (trace)	+++	+++	+++	+++	++	+++
1	Optode (full range)	++	+++	+++	+++	++	+++
2	MIMS (direct)	++	++	++	+	+	+++
3	MIMS (Exet.)	++	+	+	+++	+++	+++

The rating scheme is: regular (+), strong (++), and very strong (+++). Besides the precision, measuring frequency and potential rate detection limit, the sensor fragility, the handling in the field and the price of the consumables (sensor or label) are compared.