The UV, visible spectrophotometer is a conventional laboratory analytical instrument. It can be widely used in the qualitative and quantitative analysis of inorganic substances and organic substances, and plays an important role in the fields of scientific research, pharmaceutical, chemical industry, environmental protection, health, and epidemic prevention.

Some people say that the ultraviolet and visible spectrophotometer is a ruler and a balance. It can be used in places where there are tests and analysis. So, how do you evaluate the pros and cons of an ultraviolet and visible spectrophotometer? First, we should examine its appearance. Imagine, how can an instrument with a rigid appearance and rough workmanship be an advanced instrument? Then, we explore several important indicators that have a major impact on the use of the instrument:

1 Photometric accuracy Photometric accuracy refers to the difference between the actual measured photometric reading and the true value. It is a direct user requirement for the instrument, and every user must pay attention to it.  
2  astigmatism It means that there should be light where there should be no light. It is the main source of error in spectral measurements. Of course, the smaller the value, the better.  
The 3  spectral bandwidth refers to the band width at the 1/2 height of the monochromatic spectral line intensity profile curve emitted from the monochromator. Characterize the spectral resolution of the instrument. According to Beer's law, the spectral bandwidth should be as small as possible, but if the source energy of the instrument is weak, the sensitivity of the optical sensor is low, the spectral bandwidth is small, and the ideal measurement result is not obtained. Therefore, be careful when selecting and using the instrument.
4 Stability stability is one of the most important indicators for users. The purpose of the instrument is to be stable and reliable, and unstable is not reliable.  
5 Noise noise is also one of the important indicators of the instrument. It characterizes the instrument's ability to make dilute solutions. This indicator is also as small as possible.  
6 Wavelength Accuracy and Reproducibility Each value of the instrument is measured at a certain wavelength. If the wavelength shown and the actual wavelength deviate by a million miles, then what is the agreement between the measured value and the true value? What? The importance of this indicator can be seen.

In short, these indicators are independent and interrelated, and each indicator has a great impact on the use of the instrument. I hope that everyone can buy UV, visible spectrophotometer, compare and do more judgments, and find a stable and reliable helper.

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