What type of doctor can order a holter monitor?

Any doctor: Primary care doctors often order a holter monitor (which records heart rhythm for 24 - 48 hours) to evaluate palpitations and they are interpreted most often by internists and cardiologists. It is very helpful for the wearer to mark the moment they are experiencing symptoms by depressing a button on the device. This allows the physician to correlate the rhythm at the moment of the symptoms.