Veterinary Pulse Oximeters are a widely available piece of anaesthesia patient monitoring equipment used in veterinary practices. They are inexpensive, easy to use and provide a non-invasive method to gain real-time information on oxygen transport, accompanied by an audible pulse rate. They continuously estimate the oxygen saturation of hemoglobin in an animal's arterial blood (SpO2). A pulse oximeter uses a sensor and/or a probe to measure SpO2, which represents functional oxygen saturation.