Do i need to buy an extra adapter before plugging in the product? I do use a stabilizer and have plugged in like all my products into it. (My Tele, laptop, Router, Console etc etc) So my question is, would it be okay if I use a 220v/60 hz product without buying an adapter or a transformer? Could my stabilizer does the job? Thank You!
No problem. a 10% variation in line voltage is not important. When we engineers design stiff, we consider 220V, 230V or 240V to be the same thing. Same for 50Hz or 60Hz power.
20 volts isn't going to make a difference. The voltage can vary that much due to poor regulation from the power company. However, make sure the line frequency is the same (60 Hz).