Light Curtain normally faces alignment issues and it is extremely important to know if it fits the basic safety standard. Take a look at this yellow set of light curtain that withstands harsh environment like nobody's business.
What is the most important function for you when getting a new microscope? Upon surveying, the top answer is "easy observation of fully-focused images". Were you ever impressed by this kind of function before, or would you like to give it a try?