A microscopic display device, but there is no reliable evidence that it has the so-called disease diagnosis function. The prototype of this device is the Bradford variable projection microscope, a microscopic device invented by Robert william bradford. 20 10 in September, Bradford pleaded guilty in the case of 08-20 168-KHV, and admitted many charges, such as mail fraud, irregular drug labeling, cheating FDA, etc. He also admitted to selling a blood drop detector by fabricating lies such as "Lyme disease outbreak" and using it to diagnose and sell related drugs. Because this fake doctor who sells fake anticancer drugs and claims that his microscope can diagnose cancer has prostate cancer. In fact, detecting blood circulation with a "blood drop detector" is only a very rough qualitative observation. At best, we can only see the surface contents such as blood cell morphology, which is subjective and random. There is no corresponding theoretical basis and practical test for coagulation diagnosis of diseases.