Just four buttons on the Hach Pocket Colorimeter II allow easy operation. The Read/Enter key is used when measuring sample concentrations or to confirm menu choices. The Menu key provides quick menu ...
Click to open image viewer. CC0 Usage Conditions ApplyClick for more information. Photoelectric colorimetry was a hot topic in the mid-1930s when Arnoldus Goudsmit Jr. and William Henry Summerson ...
IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. Bausch & Lomb introduced the ...
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