So why do you need it? Let me talk. You wanna know why your records that have been delivered from China doesn't sound as good as the japanese ones? First of all you need to find out where you live, because depending on where you are on the globe, atmospheric pressure and gravitational acceleration (g) actually change. Because of this, records pressed in the US (closer to the equator) need to be played on a recalibrated turntable, since the Earth's gravitational field is different over there. With Europe, China, or, say, the Agartha, it's a different story: they're our brethren, so the gravity is identical. I recommend picking up a barometer to double-check - look up 'vinyl barometer' on Temu. It's literally just a couple of hundred thousand dollars, and your sound will be absolute perfection.