Absorbance microplate reader

Absorbance-based detection can be performed on the PHERAstar ® FSX , CLARIOstar ® , SPECTROstar ® Omega , FLUOstar ® and POLARstar ® Omega plate readers, as well as on the dedicated SPECTROstar ® Nano . BMG LABTECH was the first company to employ an UV / vis spectrometer instead of filters for absorbance detection. Upon illumination of the sample by a high-power xenon flash lamp, BMG LABTECH´s ultra-fast UV / vis spectrometer collects the entire absorbance spectrum instead of a specific wavelength . It captures all wavelengths from 220 to 1000 nm at a resolution of 1 – 10 nm in less than 1 second per well .

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Absorbance overview

Absorbance , also known as Optical Density (OD), is defined as the (logarithmic) ratio between the intensity of light hitting a sample and the intensity of that very light transmitted through the sample. While a specific wavelength of light usually selected by a filter illuminates a sample, part of this light gets absorbed. The non-absorbed light passes through the sample and is collected by a detector located opposite the light source, on the other side of the microplate well.


Since the amount of light absorbed by a sample relates to its concentration (Lambert-Beer law), absorbance has been used for the quantification of nucleic acids and proteins as well as in popular colorimetric reactions such as ELISA tests. BMG LABTECH offers a variety of absorbance microplate readers.

Absorbance Microplate Readers

The following plate readers can be configured to perform absorbance measurements. Choose between PHERAstar FSX -the high-throughput screening reader for fast read times, CLARIOstar Plus with LVF monochromators ™ for highest flexibility, Omega Series -our upgradable microplate readers for absorbance or any number of dectection modes and the SPECTROstar Nano -our dedicated absorbance microplate reader with UV / vis spectrometer and additional cuvette port.

BMG LABTECH microplate reader PHERAstar FSX from the front view

PHERAstar FSX

Powerful and most sensitive HTS plate reader
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BMG LABTECH microplate reader CLARIOstar Plus from the front view

CLARIOstar Plus

Most flexible Plate Reader for Assay Development
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Frontview of the FLUOstar Omega, a microplate reader from the BMG LABTECH Omega series

Omega series

Upgradeable single and multi-mode microplate reader series
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BMG LABTECH microplate reader SPECTROstar Nano from the front view

SPECTROstar Nano

Absorbance plate reader with cuvette port
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