(fencing) A device used in electrical fencing to detect whether or not a weapon has struck an opponent, which connects into a fencer's weapon by a spool and system wire. It makes use of lights and seem to inform successful, with different coloured lights for on goal and off focus https://gabletoppak.com/reducing-microplastics-why-gable-top-cartons-are-better-than-plastic-water-bottles/