The hardness of the penis erection can reflect the state of erectile function and is directly related to the quality of sexual life. The measurement of penile erection hardness is done by measuring the axial hardness of the penis through the built-in pressure sensor of the instrument, measuring the temperature of the penis head after erection using contact, and capturing the image of the penis after erection through the camera, and analyzing the length and circumference of the penis with software. Main purpose: Monitoring of erectile function of the penis. Method: After stimulating erection by audio-visual means, the subject wears a “hardness test sleeve” and inserts the hardness meter. When the physician prompts the patient to push, the patient pushes the penis forward as far as possible and completes the operation under the guidance of the physician. The monitoring indexes include: erectile hardness value, temperature value, length and circumference, etc. Cautions: ①The patient should make an appointment for the operation; ②Before the examination, the patient should explain to the physician the usual erectile function and ejaculatory latency; ③When wearing the test sleeve, the sleeve should be put on the root of the penis, and after putting it into the instrument to complete the operation, do not rush to withdraw it, but press the end of the sleeve and pull it out slowly; ④In the operation, under the guidance of the physician, force the penis forward, do not blindly make force, generally the penis is slightly bent or slightly painful is better; ⑤The examination environment is private. ⑤ The examination environment is private, you need to actively cooperate with the physician and take care of the equipment.