Features: This is a guitar neck straightness measuring tool, great for measuring neck curvature and adjusting the fretboard. Made of alloy and electronic components, the digital guitar ruler ensures durability and reliability with long terms use. This versatile tool set is not limited to electric guitars, but can also be used for other stringed instruments that require calibration or repair work to meet the needs. Great tool for measuring neck curvature and adjusting the fretboard, a necessary tool for guitar calibration and maintenance. Compact enough to be handheld, but large enough to provide accurate readings. Specifications: Materials: Alloy Neck rod size: about 30x4x1.1cm/11.81x1.57x0.43inch Digital display size: about 5.7x2.5x12cm/2.24x0.98x4.72inch Package Includes: 1pc Guitar Leveling Digital Ruler Tool note: Please allow 1-2cm errors due to manual measurement, make sure that you not mind before you order. Due to difference between different monitors, the picture may not reflect the actual color of the item.