A kind of devices, systems, and methods, for measuring the one or more object/users of height. Once surveying high equipment to be calibrated, retracts workbench and be located at sensing user/object close to top and its apart from being captured, storage, calculating, final height object/user is determined by laser sensor. Elevation carrection may be displayed on screen, and the survey shown including screen is high with this or other devices, such as tablet, smartphone or ratio,.It can be compared to each other from each sensing user/object close to altitude information. The height measuring device further includes one or more users that prediction algorithm determines the following height.
