Profile: Vanguard Instruments Co., Inc. is a manufacturer of test instruments. We are an ISO 9001:2000 certified company. Our product line includes circuit breakers, test fixtures & nipples, test plugs, & lightning protection apparatus and accessories. We also provide automotive & electronic fuse, fuse holder, high speed fuse, medium voltage fuse, power fuse, & semiconductor fuse. Our brands include Vanguard Instruments™.