A Lebanese customer asked about our x ray collimator. He sent a beam limiter M-38. This x ray collimator is the same as our NK202. It is a limiter for 150KV tube. The customer reflects that it has already I bought two kinds of beam limiters for testing. They have not been successful. There are errors in the analog light and X-ray illumination of LED or halogen lamps. The error phenomenon of this x ray collimator will appear in various brands, but there are big and small problems. The error phenomenon of the x ray collimator is different for each customer. The error phenomenon of the beam limiter is paid more attention by the customer. Some customers are not very careful. The error phenomenon of the x ray collimator will not produce any small error. Affected.