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An accurate, precise, and affordable light emitting diode spectrophotometer for drinking water and other testing with limited resources

Fig 15

The R2 values for the Agilent Technologies Cary 60 UV-Vis (ultraviolet-visible), Hach DR-2700, a Hach 2010, a Thermal Electron Spectronic 20D+, and 2 light emitting diode (LED) spectrophotometers used in this study (Tables 2–4).

Fig 15

doi: https://doi.org/10.1371/journal.pone.0226761.g015