Starrett CP505A-12 ProSite 5-in-1 Aluminum Combination Protractor 12"

The Starrett CP505A-12 ProSite Combination Protractor is a precision-machined, 12" (300mm) aluminum 5-in-1 measuring tool designed for carpenters, plumbers, builders, and serious DIYers who demand accuracy and efficiency on every cut. Part of the trusted ProSite 505 Protractor family, the CP505A-12 eliminates guesswork and error-prone calculations, saving time and reducing material waste.

Precision machined from lightweight aluminum, this protractor features a Teflon® O-ring for smooth, precise dial operation and laser-engraved scales for exceptional long-term readability and accuracy.

5-in-1 Functions:

• Miter Cut Scale — Transfers readings directly to the miter saw for accurate miter joints
• Single Cut Scale — Direct single-cut angle readings for straight crosscuts
• Compound Cut Conversion Table — Specifically designed for compound miter saws; simplifies cutting crown molding as it lays flat
• Full Protractor — Reads 0°–180°–0° and 180°–0°–180° for complete angle measurement
• Roof Pitch Reference — Built-in quick reference to common roof pitches

Specifications:

• Type: Dial Reading Combination Protractor
• Material: Lightweight Aluminum
• Blade Length: 12" (300mm)
• Angle Range: 0°–360°
• Resolution: 1°
• Weight: 1 lb (454g)
• Made in the USA

The Starrett CP505A-12 is an ideal layout tool for professional tradespeople and dedicated DIYers who need reliable, repeatable angle measurements transferred directly to their saw — every time.