This simple but super useful tool is a bubble inclinometer, also known as a goniometer. It's used by physiotherapists, trainers, and in rehab to accurately measure joint angles and range of motion – think checking how far you can bend your knee or raise your arm after an injury.It's really easy to use. The floating bubble and printed dial let you get readings with about one degree of accuracy, and it works in both directions so you can read it from either side. The flat or curved base (depending on the model) helps it sit securely on different body parts.It's a must-have for tracking progress in recovery, ensuring exercises are done correctly, or for sports diagnostics. The non-slip base is a nice touch for stable measurements. A professional-grade tool that's straightforward and reliable for anyone working in physical therapy or personal fitness.