An assembly for tissue retraction in surgery includes a pair of arm members removably positioned on and movable along an elongate support member. This portable device will offer a safe sterilization method for the general public, both in-home and in commercial use. The tag output is an RF \u201cbackscatter signal\u201d having encoded temperature data indicative of the internal temperature of the food that the tag is buried in. A light modulating element is disposed over the second electrode. Herein, an end portion of the above described optical path for transmitting an optical signal protrudes from the surface of the outermost insulating layer.