Pacific Sentry's Small Animal Ammonia Sensor conveniently monitors and detects ammonia in animal habitats on a continuous basis. Simply attach the sensor to the inside of the cagehabitat at ground level and relatively close to where the animal spends the majority of its time (for multi-level cages it is recommended to have a sensor for each level). Easily observe the sensor to ensure safe ammonia levels are maintained. Sensor reaction time is approximately 1-2 hours for increasing levels of ammonia and 4-8 hours for decreasing levels of ammonia. When taken out of the protective cartridge, reaction time is reduced to 15 minutes and 2 hours, respectively. Invest in your pets safety and have happier, healthier animals. There is no way to effectively eliminate ammonia; however, there is now a way to effectively monitor and control it. Small animals include: Mice, rats, gerbils, hamsters, rabbits, ferrets, guinea pigs, chinchillas, squirrels, hedgehogs, etc.