Feature: 1. Adopting an electrochemical sensor, which gives a quick and accurate measurement. 2. With a large LCD screen displaying the measured results, you can get ammonia gas concentration at a glance. 3. The ammonia gas monitor has an audio and visual alarm, you can set the audio alarm decibel that can give you an obvious prompt. 4. Portable and handheld, easy to operate and carry. 5. Widely used in gas station, hospital, agriculture, exhaust gas leak, chemical industry detection and environmental monitoring. Specification: Specifications: Model: AT8500 Material: ABS Detection Gas Type: Ammonia Measuring Range: 0~100ppm Resolution: 0.1ppm Accuracy: <50PPM±10% >50PPM±6% Temperature Range: -10°C~50°C Response Time: T90≤120 seconds Recovery Time: ≤120 seconds The Principle of Sensor: Electrochemical type, life for two years Display: TN Segment type LCD Alarm Mode: Acoustic and light double alarm Power Supply: 3.7V rechargeable lithium battery Operation Time: >50 Hours (Continue working) Working Environment Condition: -10℃~50℃, <95%RH (non condensing) Item Size: 180 * 65 * 32mm / 7.08 * 2.55 * 1.25in Item Weight: 149g / 5.25oz Package Weight: 359g / 12.66oz Package Size: 24.5 * 9.5 * 6cm / 9.64 * 3.74 * 2.36in Package List: Package List: 1 * Ammonia Gas Detector 1 * USB Charging Cable 1 * Storage Bag 1 * Battery 1 * User Manual (English)