Klett Bio Colorimeter, a device used in colorimetry to measure the absorbance of particular wavelengths of light by a specific solution. Colorimeters are commonly used to determine the concentration of a known solute in…

Electric-powered meter with instructions housed in wooden box. Movable components within box: two (2) slide glass filters (1 with red, green, and blue slides; 1 with orange, green, and blue slides); one (1) encasing to…

A: Cast iron base attached to a sloping cast iron upright supporting the reader, prisms, sample cups, plungers, and a mechanism for raising and lowering the sample cups; two metal knobs control the height of the sample…

Wooden box with metal instrument panel on top; four small black rubber feet on bottom; front of wooden box contains printed instructions and folds down to show inside of instrument; rectangular wooden area attached to…