9 apparatuses and instruments used to detect and measure assays in microtiter plates; portable apparatuses and instruments used to detect and measure assays in microtiter plates; apparatuses and instruments used to detect and measure absorbance at different light wavelengths for immunoassays; portable apparatuses and instruments used to detect and measure absorbance at different light wavelengths for immunoassays; apparatuses and instruments used to detect and measure assays in plates for research, bioassay, drug discovery, and manufacturing; portable apparatuses and instruments used to detect and measure assays in plates for research, bioassay, drug discovery, and manufacturing