Clinically, when diagnosing whether men have organic ED, professional sclerometer is also used to check the erectile state at night. The instrument is about the size of a palm and can be fixed on the thigh. There are also two leather rings on the head and bottom of the penis. You can record the number of penile erections in one night and the time and hardness of each erection. This examination is very important for the differential diagnosis of physiological and psychological ED. Some ED patients will find that they have no erectile dysfunction after this examination, and the ED problem will be cured.