We skipped tests the Autonomous SmartDesk Professional (previously generally known as the SmartDesk two) as it lacks an anti-collision element, which is an important safety consideration for anyone employing a standing desk. However, the extended height frame I tested raises every one of the way as many as 51.6 inches. https://autostandingdesk54208.laowaiblog.com/37859470/the-ultimate-guide-to-standing-desk-work