Numeroastro Shri Sidh Chandra Dev Yantra In Pure Copper (3 Inches) (1 Pc) -Numeroastro Chandra Yantra has unlimited power to give knowledge. Chandra Yantra is prepared by basic mantras of Moon. In todays world every person requires knowledge and peace of mind. Chandra Yantra is useful for everyone. Method of Use: Worship this yantra with faith. This can also be worn. Mantra: Om Shraang Shring Shraung Sah Chandramase Namah.