The American-made Trackmaster TMX428 treadmill was built to be the best stress treadmill in the health and fitness industry. The TMX428 treadmill is smooth, quiet and reliable with a design focused on the absolute safety and comfort of the patient. The treadmill self-calibrates, making it virtually maintenance-free. This treadmill's safety features include a low profile deck, .1MPH minimum operating speed, incredibly smooth belt operation and multiple emergency stop switches. The TMX428 treadmill is only sold to OEMs of stress testing systems and their authorized distributors.