The followings are the results of confirming the brightness evenness in the petri dishes. The PSF-1100 has a sufficiently uniform brightness when counting colonies, and the PSF-2100 type has a more uniform brightness.
In order to achieve good measurement accuracy, it is necessary that there is no illumination unevenness in hardware and that it can be corrected even if there is uneven brightness in the culture medium itself.

The PSF series is designed to achieve a uniform background in both hardware and software.
In the hardware, we have achieved a uniform background in both bright and dark field conditions in the measurement area by our original lighting technology.
In addition, even with the software, brightness unevenness of the culture medium itself can be corrected, and all areas other than colonies can be made into a uniform background.
As a result, even if there is a slight difference between the culture medium and the colonies, it is possible to select only the colonies and count the number with high accuracy.