Here is a stair climbing machine that can give you a kickass workout. The Pro 6 Aspen StairMill Machine gives you a low impact cardio workout with max speed of 120 steps per minute. You can change the face to suit your fitness. It has a console to show time, distance in floors, speed in steps per minute.
This stair machine comes with a contact heart rate monitor. It is electromagnetically braked and comes with a step lock safety system.