The QRAE 3 is a durable and versatile diffusion or pumped one-to-four gas monitor for detectionof combustibles, oxygen, hydrogen sulfide, carbon monoxide, sulfur dioxide and hydrogen cyanideand other gases. Standard features include easy-to-change battery packs, easy access to sensors,internal vibrating alarm, loud 95dB audible alarm, and a water-resistant IP-65 case design.The rechargeable Lithium-ion battery delivers up to 14 hours of continuous operation innon-wireless diffusion mode. Base: PGM-2560 Series Pump & Diffusion: QRAE 3 - Diffusion Certification: ATEX (Europe + India) Wireless: 865.6+866.4M,RM900, India Socket1 Sensor: Empty Socket2 Sensor: NO2 (0 to 50 ppm, 0.1ppm res.) Socket3 Sensor: Liq. O₂ (0 to 30.0%, 0.1% res.) Socket4 Sensor: NH₃ (100 ppm, 1ppm res.) Kits: Accessory Kit