StewMac Fret Scale Rule, Martin / mandolin / banjo rule

Determine fret spacings and layout fretboards accurately.

"Before working on any vintage guitar, I always check fret accuracy with these rules."—Dan Erlewine

Our accurate, high quality 22" x 1-1/4" x .030" rules, crafted of durable stainless steel for years of service in professional repair shops. Each rule has four different fret scales, and features precisely etched, easy-to-read markings on both sides.

Martin / mandolin / banjo rule

• 24.900" Martin short
• 25.340" Martin long*
• 13-7/8" mandolin
• 26-3/16" banjo

*Martin long scale: The scale used on Martin Dreadnoughts is commonly referred to as 25.4" but is actually 25.34".