Ketu Yantra is worshipped in order to eradicate the effects of mental trauma and untimely accidents. If your mind remains disturbed, then you should worship Ketu yantra. It will be very beneficial for you. People suffer from the ill effects of Ketu Planet such as physical pain, injury, skin diseases, etc. But if you set up and worship this yantra regularly, you will attain health benefits due to its grace.
Ketu yantra must be established during Ketu Nakshatra on Monday. Take a holy bathe before setting it up and chant Ketu Beej Mantra 21 times after keeping the Yantra in front, “ॐ स्रां स्रीं स्रौं सः केतवे नमः / “oṃ srāṃ srīṃ srauṃ saḥ ketave namaḥ”. Sprinkle Gangajal or cow’s raw milk on the yantra. After that, wish for a good outcome and then establish it properly.