The Fluke CXT280 Extreme Case is a rugged and durable protective case designed for demanding environments. Its construction ensures it's unbreakable, watertight, airtight, dustproof, chemical resistant, and corrosion proof, making it ideal for field use and harsh conditions. The automatic purge valve equalizes pressure changes, and the case floats in saltwater, even with a significant load. Compatible with Fluke 287, 289 multimeters and 1621 earth ground testers.