Medical diagnostics monitor and measure vital signs and evaluate patients for treatment. Stethoscopes pick up and amplify heartbeats, lung sounds, and other body sounds. Blood glucose monitoring devices test blood sugar levels in emergency situations and for routine monitoring of diabetes and hypoglycemia. Blood pressure monitors measure the force of blood circulating through arteries to check heart and circulatory system function. ECG supplies assist with performing tests using an electrocardiogram (ECG) machine, which detects heart rhythms. ENT diagnostic instruments are tools for examining the ears, nose, and throat. Pulse oximeters provide rapid readings of heart rate and oxygen saturation levels to check heart and lung function.