The Holter ECG monitoring market size was valued at $320.81 million in 2020, and is projected to reach $696.67 million by 2030, registering a CAGR of 8.4% from 2021 to 2030. A Holter monitor is a small, wearable device that tracks the heart rhythm. It detects the tiny electrical signals of the heart and sends it to the surface of the chest. It is worn particularly to identify the defect in the working of the heart.