Shani Yantra/ Saturn Yantra is used to pacify an afflicted Shani/Saturn and achieve Rajayoga through complete blessings of Shani.
When Saturn is malefic in a horoscope, in transit or causes Sadesati, use of Shani Yantra is very Beneficial.
Shani Yantra/Saturn Yantra is useful, when one feels depressed. It indicates success in worldly affairs, success in business and the man touches the dizzy heights.
Beej Mantra for this Yantra :- "Om Preeang Preeng Prong Sa Shanye Namah"