Cardiac tester is a generalized name, the more commonly used instruments for cardiac testing in the clinic, there are 24-hour dynamic electrocardiogram, ordinary electrocardiogram, electrocardiographic monitor, cardiac ultrasound, and laboratory equipment, etc. 24-hour dynamic electrocardiogram and ordinary electrocardiogram, is mainly to detect the changes in the electrocardiogram, to rule out the existence of arrhythmia, but also can be used as a coronary heart disease, angina pectoris, myocardial infarction, and other clinical diagnosis. The main purpose is to detect the changes of ECG to rule out the existence of arrhythmia. Cardiac monitor is mainly used for dynamic monitoring of heart rate, oxygen saturation, blood pressure, etc. of critically ill patients, so as to grasp the real-time changes in the patient’s condition. Cardiac ultrasound is a kind of ultrasound examination, mainly to understand whether the patient has cardiac insufficiency, changes in atrial and ventricular structure of the heart, as well as heart valve disease, congenital heart disease and so on. Laboratory examination instruments and test strips, such as cardiac damage triptych, are mainly used to understand whether there is any damage to the myocardium and to exclude myocardial infarction.