SAR is Specific Absorption Rate, and is measured in Watts/ Kilogram. Put simply, it indexes the amount of radio-frequency radiation emitted by the cellphone. Higher SAR value implies higher per unit radiation from the phone. You can check the SAR value of your phone by dialing *#07#
For cellphone purchase. The user evaluates by screen size and quality, video and sound, memory and speed, look and feel. Sadly, we do not prioritize the final most important feature in a cellphone, the SAR value.
Cellphone SAR value is measured in an isolated environment. The cellphone is held at various common positions next to the head and the body. The laboratories use standardized human body models filled with liquids. These liquids simulate RF absorption characteristics of human tissues. Thereafter, a robotic probe takes a series of electric field measurements in precise pattern and configuration.
Conclusion about the importance of SAR
The use of mobile phones for more than 30 minutes/day over sustained periods of time ( 8 to 10 years) is suspected to have doubled/quadrupled brain tumor risk. Metric and observation was provided by Institute of Medical Sciences (IMS) in their study released on February 20th 2017.
Safety begins at home. While users and buyers pay all attention to other attributes and features, SAR is nearly always given a miss. So the next time, you are purchasing a phone or making a decision, please take into account the SAR rating of the phone. The reason being that it is just better to be safe, no?