Judging from the appearance of the purification board, observe the leakage edge of the product, the crystal of the high-quality purification board section is very fine, smooth and delicate to the touch, looks like no impurities, and the color is smooth and transparent.
从净化板的外观形象来进行判断，观察一下产品的外漏边缘，优质的净化板切面的结晶非常细密，摸起来光滑细腻，看起来没有任何杂质，颜色光滑透亮。
You can rub it hard with your hands and it won't fade.
用手使劲搓都不会出现褪色蜕皮现象。
The poor quality of the purification board is dull in color, feels rough with the hand, there will be small impurity particles, and looks luster.
而劣质的净化板颜色暗淡无光，用手摸起来手感粗糙，会有细小的杂质颗粒，看起来没有光泽。
3, in the selection of purification board to use the hand to knock the product, from the sound can be judged the quality of the purification board.
3、在选择净化板时要用手敲一下产品，从发出的声音就可以判断出净化板质量的好坏。
The sound emitted by the high-quality purification board is crisp and relatively loud.
优质的净化板发出的声音是清脆的，比较响亮。
And the inferior ones make a dull sound.
而劣质的发出的声音比较闷。
