A least-squares fit to the data in Figure 2 shows that the absorbance measurements made using the homemade spectrophotometer are in close agreement with those made using the Ocean Optics USB2000+ over the typical range of absorbance measurements up to A ∼1. As is usual for absorption spectrophotometry, it is desirable to keep absorbance values within this range as measured signals
become comparable to the dark signal (i.e., become