Durable ABS construction: built from impact and weatherresistant ABS material so the bubble level withstands outdoor use and repeated handling during tuning and field work. Simple, reliable bubble indicator: the builtin bubble gives a clear visual reference for level alignment, removing guesswork when checking string or arrow orientation. Easy attachment and use: clips onto your bowstring or mounts on an arrow quickly and securely for immediate checks; no special tools or complex setup required. Improves consistency and accuracy: helps you set and maintain a repeatable nock position, reducing variance shottoshot and making finetuning faster and more effective. Versatile compatibility: designed for direct use with typical bowstrings and arrows to support routine tuning, sighting, and preshot checks. Typical applications Bow tuning at the range: use during initial setup and periodic adjustments to confirm consistent nock position and string alignment before dialing sight pins or rest settings. Field or hunting prep: perform quick, onsite checks to ensure your setup remained true after transport or rough handling in the field. Equipment maintenance and coaching: use in tuning sessions with a coach or when servicing equipment to document and reproduce precise string and arrow alignment. What you get A compact, robust bubble level that provides a straightforward visual reference for aligning your bowstring or arrow and helps you achieve steady, repeatable tuning results without complicated procedures.