The Altair 4X Multi gas detector is as tough and functional as it looks. A rugged housing provides unsurpassed durability including the ability to survive a 20 foot drop. And with large glove friendly buttons and a high contrast display the Altair 4X is easy to operate in any work environment even low light conditions.Workers who face potentially dangerous situations deserve the best protection available. MSA works tirelessly to build smarter and better gas detection instruments that people across the world rely on. To that end the Altair 4X represents advanced technology. this unit is new and was shown as a sample only never used. It is offered here with a Altair single gas detector and a quick check station as a complete kit. This is a great value for anyone getting started with gas detection or an old pro.