Table 5.

An overview of sensor accuracies based on published literature and our proposed accuracy ranges.

Parameter			Accuracy Ratings
	Target	Acceptable	Tolerable	Poor	Ref.
pH	≤±0.2 units	>±0.2–0.5 units	>±0.5–0.8 units	>±0.8 units	[62,63,64,65]
Electrical conductivity	≤±3%	>±3–10%	>±10–15%	>±15%	[61,62,63,64]
Dissolved oxygen	≤±5%	>±5–10%	>±10–15%	>±15%	[61,62,63,64,65]
Total nitrogen	≤±5%thisreview [TR]	>±5–10% [63,64]	>±10–15%	>±15%	[TR]
Chloride	≤±5%	>±5–10% [64]	>±10–15% [63]	>±15%	[TR]
Calcium	≤±5%	>±5–10% [64]	>±10–15%	>±15%	[TR]
Sodium	≤±5% [65]	>±5–10%	>±10–15%	>±15%	[TR]
Chemical oxygen demand	≤±5% [67]	>±5–10% [65]	>±10–15%	>±15%	[TR]
Boron	≤±5%	>±5–10%	>±10–15%	>±15%	[TR]
Sulphate	≤±5%	>±5–10%	>±10–15%	>±15%	[TR]
Potassium	≤±5%	>±5–10%	>±10–15%	>±15%	[TR]
Alkalinity	≤±5%	>±5–10%	>±10–15%	>±15%	[TR]
Magnesium	≤±5%	>±5–10%	>±10–15%	>±15%	[TR]
Escherichia coli	≤±5%	>±5–10%	>±10–15%	>±15%	[TR]