欧美做受高潮 I 91偷拍视频 I 精品视频免费观看 I 日本日韩欧美 I 成人片在线看 I 国产精品污 I 国产精品扒开腿做爽爽爽视频 I 日本视频www I 亚洲а∨天堂久久精品2021 I 欧美日韩高清一区 I 一级片aaa I 国产欧美一区二区三区鸳鸯浴 I 很黄很黄的网站 I 综合色吧 I 幸福宝在线观看 I 最新超碰在线 I aaa天堂 I 午夜精品久久久久久久久久 I 精品久久蜜桃 I 一区二区三区啪啪啪 I 日韩综合一区二区三区 I 国产另类av I 毛片av免费在线观看 I 欧美一区二区三区久久精品 I 中文字幕欧美人妻精品一区 I 一区二区高清 I 99精品视频在线观看 I p站在线观看

                

 
Product Introduction:
■ Easy to use and portable
■ low price with long lifetime
■ can be used to detect many defects, like micro crack, bubbles,  impurity, crystal subgrain
■ When the laser go though the crystal, if it is monocrystal the light should be scattering, in macro it should be white.
■ If there is bubble, the light also be scattering, but in macro there will be white spots.
■ The cracks can be easily observed.
■ With the laser light you can find the impurity easily.
 






 
Polarized glasses:
Use Oil of wintergreen to wipe the C-axis surface of the sapphire crystal ingot, and use polarized glasses you will see the concentric interference rings on the ingot surface.
 




 
Customer:
American, Europe, Asian sapphire manufacturers.