Component testing: Some enterprises don't have testing reports issued by national authorities, but confuse consumers with testing results issued by trademark or personal testing institutions. Stones with unknown composition are not recommended.

Ultrasonic detection: When the Spun stone rubs against human body, it will generate 3708 ultrasonic pulses with the frequency range of (200-2000)kHz, which is much higher than other materials. This is why Bian Shi Scraping Board is more suitable for scraping.

Far-infrared detection: wearing or using bian stone can speed up the blood flow of human microcirculation by 20%, which is called promoting qi and activating blood circulation in traditional Chinese medicine, and modern science can explain it as "far-infrared phenomenon"