Durable ABS construction Made from strong ABS material to withstand outdoor conditions and regular use. Built for durability and reliable performance during tuning and fieldwork. Simple, fast setup Hang the bubble/string level directly on your bowstring or arrow for instant alignment checks. No tools or complicated steps required. Improves accuracy and consistency Ensures repeatable, correct nock positioning to support precise bow tuning and sight placement. Helps reduce guesswork and speed up setup. Precise vertical and horizontal alignment Use the bubble level to verify both vertical and horizontal planes, supporting accurate nock alignment and sight leveling so you stay on target. Intended function and compatibility Designed to be used on a bowstring or arrow to check alignment and nock position. Functions as a portable alignment tool for tuning and sight mounting. Use scenarios Bow tuning: Quickly confirm nock position and string alignment while adjusting brace height, rest position, or arrow nocking points. Sight mounting and verification: Level sights and verify vertical/horizontal alignment during installation or before going to the range. Field or range checks: Perform fast alignment checks outdoors to ensure consistent setup before practice or hunting. What you get A rugged bubble/string level that mounts on your bowstring or arrow for straightforward alignment work, built to support accurate tuning and dependable performance in outdoor environments.