GRI (George Risk Industries) is an American manufacturer of magnetic contact switches, reed switches, and sensor devices used in intrusion detection and access control systems. GRI surface-mount and recessed magnetic contacts are installed on millions of doors and windows, providing the fundamental open/close detection that alarm systems rely on. With form factors for every door type — standard, overhead, rolling, and high-security — and options for armored cable, wide-gap, and weatherproof housings, GRI contacts are the industry standard for perimeter point protection.
