The U Box Apparatus is a specialized testing device designed to assess the self-compacting properties of fresh concrete. This apparatus measures the ability of concrete to flow under gravity and pass through rebar without the need for external vibration, making it essential in evaluating workability and ease of placement, especially in densely reinforced structural elements. Constructed with durable materials to ensure precise and reliable readings, the U Box features two chambers separated by a removable gate and a series of reinforcement bars to simulate real-world conditions.