Order any one of the test systems complete and the only additional item(s) needed are the individual modules to perform each test.Part #Description2888Trio 3 in 12650Stand and SlingElectronics has up to three inputs allowing users to perform three very different tests with one electronic system when studies call for doing so.All data is stored and displayed in the electronics supplied.Part# 2650 Stand and sling sold separately.Category: Analgesia EquipmentTags: Analgesia EquipmentTechnical Specifications / Features:System allows up to three different tests with one electronic unitAll data stored and displayed in the supplied electronicsModules for each test are ordered separatelyPart numbers: 2888 (Trio 3 in 1), 2650 (Stand and Sling, sold separately)