Love is natural feelings no one can buy this and no one can judge the limit of love but i am going to tell you some special kind of device which can measure the love it seems to be unrealistic but for some reason this may be true .
A korean cellular copamny invented a special type pf device which are put into the cell phone to detect the love by analyzing the voice.
They called it love detector service the technology uses the persons voice and analyze the different pattern of its frequency and see if the person is speaking with love and affection or not.User later receive a message from the company about the analysis of the conversation which tells about the honesty and love of the speaker.