The present invention provides for a system and method for measuring the height of a guest at a theme park, including employing an ultrasonic emitter and sensor to determine height. The park may have a plurality of different predetermined minimum height ranges or categories for certain rides and attractions, which must be met by a guest before the guest is allowed to participate. The results of the height measurement are provided on indicia and given to the guest to use at rides throughout the park. The device may be a wristband affixed to the guest, and displaying a color or symbol based on the height of the guest. The guest would be allowed to participate in an attraction provided the color code matches the minimum requirements of the attraction. This present invention may eliminate the need to check the height of the guest at each ride.