The best electrical muscle stimulator on the market depends on several factors, including what the user needs it to do, the functionality of the device and the reputation of the manufacturer. Some EMS units can do electrical muscle stimulation only, which is used to train and build up muscles.
Other units are combination EMS and TENS units, which means they can also do transcutaneous electrical nerve stimulation. TENS therapy is used in pain treatment to block nerve signals in order to relieve pain. Consumers should consider whether they need a prescription and buy from a reputable manufacturer with a good warranty and good return policy. They should also consider what is included with the unit, such as electrodes.