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Durable string height gauge ruler with precision etched markings that won't wear out easily with continuous use Made of stainless steel material, sturdy and durable, anti-rust and wear-resistant, not easy to damage Accurate and convenient pocket-sized measuring tool can be taken anywhere Suitable for measuring string instruments such as electric guitar, electric bass, acoustic guitar, acoustic guitar, electric box guitar finger plate measurement Fingerplate polishing gasket protects the fingerboard fret from scratches and damage during sanding and polishing