The Pet-Temp Instant Ear Thermometer makes temperature measurement and health monitoring a quick and easy procedure. With respect to pet body temperature, just like in humans, temperature is the first vital sign that should be monitored if your pet is sick or illness is suspected. The traditional method of feeling an animal's nose is not reliable, and rectal thermometers are messy, difficult and stressful on pets. By measuring the infrared heat waves emanating from an animal's eardrum region, the Pet-Temp Ear Thermometers provide an accurate reading of 'core' body temperature in only one-second. These unique ear thermometers are the only ones specifically designed for companion animals and work effectively on dogs, cats, puppies, kittens, rabbits, guinea pigs, ferrets and chinchillas.