By the way, what brand of imported fluorescence spectrometer do you recommend?

For imported brands, Olympus is more recommended. If nothing else, the international popularity and influence of Olympus alone is a good endorsement, and its products are very good in function and quality. Vanta, for example, is very durable. It has passed the rating standard of IP65 and the drop test, and can work continuously all day. These are important factors to be considered in practical use.