Large measuring range & high accuracy - The Ammonia detector is constructed with a high-quality electrochemical sensor. Measuring ammonia gas range 0~100PPM, with resolution of 0.1PPM and high accuracy +/- 2%, this air quality meter works well in continuous monitoring NH3 in real time. User-Friendly Alarm - You can set two alarm values, high and low, to alert you with a beeping and a bright light as needed. Ideal for poultry Farms, Pig Farms, Horse Stables, Livestock, Cattle, Landfill, Animal Welfare Shelters, Fish Farms, Waste Management. Rechargeable and Long-lasting - Featuring a built-in 1600mAh rechargeable battery, the gas detector offers an extended battery life of up to 30 hours. Conveniently recharge the battery via the included USB cable. Tripod Hole for Mounting - This NH3 Gas Monitor has a tripod hole that allows you to free your hands while measuring. It also measures temperature and humidity so you can keep track of the air in all directions. Robust Alarm System and Long Sensor Life: Set two alarm thresholds for immediate alerts via light and sound. Plus, our sensor's extended lifespan of over two years offers reliable, long-term performance, reducing the need for frequent replacements.