This is an interesting idea, it’s a detachable radiation meter that is designed to be attached to plates. The meter is able to detect whether your food has absorbed too much radiation and will warn you if your food is toxic. One ring indicates a small amount of radiation, however, the red LED lights indicate the food contains more radiation than the danger level you have specified. The meter ‘s sensitivity can be adjusted to which ever setting you are willing to accept and is designed to be taken off before the plate is put into the dishwater.