(fencing) A tool used in electric fencing to detect whether a weapon has struck an opponent, which connects into a fencer's weapon by a spool and overall body wire. It utilizes lights and sound to inform a success, with different coloured lights for on target and off focus on hits. https://gabletoppak.com/from-plastic-bottles-to-gabletop-cartons-a-step-toward-solving-the-plastic-pollution-crisis/