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Portable Nh3 Ammonia Gas Detector (MTPG03). Multi-Gas Detection: Detects Combustible Gas, Oxygen, CO, H2S, NH3, and more. Fast Response Time: T90 response time is less than 30 seconds. IP66 Protection: Dust and water resistant for indoor and outdoor use. Long Battery Life: Up to 300 hours for toxic gas and 8 hours for flammable gas. Triple Alarm System: Visual LED, 85dB buzzer, and vibration alerts. Clear Display: Large STN LCD shows real-time data and system status.