Yantras are like diagrams. If you open a transistor or a chip, you will see a circuit diagram on the chip. Yantras are circuit diagrams for cosmic energy, they are used for storing cosmic energy. It takes a long time to study these in depth. Today you will find many people who make false claims and advertisements saying “I make so-and-so kind of Yantras” and they charge huge amounts of money like 5 to 10 lakh rupees. I tell you, do not go for all these kind of things. Do not get caught up in such kind of fraud. There is nothing in that.
On TV today you will see all sorts of advertisements for these, such as one claiming to have a Goddess Lakshmi Yantra and it asks you to pay Rs. 5 Lakh for it. The people who make these advertisements themselves do not even know the science and the way to use these Yantras.
There are very few qualified pundits or spiritual people who are really qualified and have the correct knowledge of using the Yantras. You can of course purchase a Sri Yantra and install it at your home. There is no problem in that.
-Sri Sri Ravi Shankar <Mon, 01/06/2015 Bangalore, India>