I purchased this on Rakuten for 6980 yen two years ago, but I sold the telescope itself, so I no longer have a use for it and have decided to sell it. This is used for adjusting the optical axis of a telescope. I excel at making subtle adjustments. It can be used with 1.25-inch and 2-inch eyepieces (two conversion adapters are included). - Operation check: Red laser output confirmed Thank you for looking.