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Spectrophotometers are often used in chemistry and quantitatively measures the reflection or transmission properties of a material as a function of wavelength. It is more specific than the general term electromagnetic spectroscopy in that spectrophotometry deals with visible light, near-ultraviolet and near-infrared, but does not cover time-resolved spectroscopic techniques. Spectrophotometry is a tool that hinges on the quantitative analysis of molecules depending on how much light is absorbed by coloured compounds. Spectrophotometry uses photometers, known as spectrophotometers, that can measure a light beam's intensity as a function of its colour. Important features of spectrophotometers are spectral bandwidth (the range of colours it can transmit through the test sample), the percentage of sample-transmission, the logarithmic range of sample-absorption and sometimes a percentage of reflective measurement.