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By certification 
Descriptions:
Great for your 7.62X54R style rifle
Easy-to-use, self-contained boresighting system fits in the chamber of your rifle or pistol and projects a powerful red laser beam aligned with the bore axis for sighting to the point-of-aim without firing a shot. Works with scopes, holographic red dot sights, and variety sights. Durable, machined brass housing looks like a cartridge case but actually contains the entire laser system and batteries. Insert the batteries and screw the cap on the housing to turn on the laser; remove the batteries to turn off. Insert the entire assembly into the chamber, gently close the action, and aim at a target 20-30 yards away. Adjust windage and elevation of the scope or sights so point-of-aim is zeroed on.
Specifications:
1.Material: High Quality Aluminium
2.Laser wavelength: 635-655 nm.
3.Minimum Range for Sighting: 15 yds
4.Maximum Range for Sighting: 100 yds
5.Operation: On/Off End Cap
6.Laser Type: Visible Red Laser
7.Power: < 1mW
8.Battery: AG3 3X
9.Total length: 54mm (2.12")
http://www.sabretacticalsupply.com/
