The Holter monitor is device patients are prescribed to wear when their doctors need them to diagnose and evaluate certain heart-related issues. These help determine the functioning of the heart by measuring the heart’s rate and rhythm. Patients usually wear the device for one to two days while going about everyday life. Doctors may direct patients to wear a Cardiac Holter monitor for various reasons. At Danlee Medical Products, Inc., we are your source for a wide range of cardiology products, including Holter monitors.