A portable easy-to-use handheld ECG waveform recorder (Model MD100B) for monitoring arrhythmia at home or travel. Held with two hands, it displays and records 30 seconds of ECG signal each time to catch the occurring arrhythmia. Built in memory allows up to 200 ECG recordings. It is an ideal heart monitor for people with irregular heartbeats, high risk of heart attack, congestive heart failure, or high and unstable blood pressures. It is a US FDA registered home monitoring device. The user should always consult with their doctor for interpretation of the recorded ECG data and further diagnosing of potential heart complications.