Starrett Plastic Miter Protractor Angle Finder 7in - Accurate Miter

In this review the Starrett 505P-7 Plastic Miter Protractor is presented as a simple, low-cost angle transfer tool for tradespeople and DIYers who need repeatable miter settings. The bottom line: it is for carpenters, plumbers and home renovators who want a compact, reliable protractor that reduces waste by giving a direct saw setting. Construction is molded engineered plastic and the tool uses two laser engraved scales so the reading you set on the tool matches the miter saw setting whether the tool is flipped or reversed.

Key Features

• Dual laser engraved scales: Two clearly marked scales provide both the miter cut arrow for joints and a single cut arrow for fitting one piece to an angle, so users can transfer angles without conversion math.
• Engineered plastic construction: Lightweight but durable material keeps the tool affordable and resistant to typical jobsite knocks and drops.
• 7in length: The compact 7in size fits easily in a pouch or toolbox and still spans enough surface to align edges for accurate transfers.
• Reversible readings: The design ensures the reading is correct whether the protractor is upside down or backwards, removing a common source of error.
• Simple saw-setting guidance: Arrows on the tool directly indicate the exact miter saw setting, making it faster to set a saw without repeatedly measuring and cutting test pieces.

Who It's For

The 505P-7 is best for carpenters, plumbers and DIY home improvers who need a no-frills tool to measure and transfer angles quickly. It is particularly useful on jobs that involve repeated miter cuts where saving time and reducing waste matters.

It is less suited to precision metalworking or applications that require heavy-duty, wear-resistant materials; those users should consider metal protractors or digital angle finders with finer resolution.

Pros & Cons

Pros

• Clear dual scales eliminate the need to convert angles for common miter and single-cut applications.
• Plastic construction keeps weight and cost down while offering reasonable jobsite durability.
• Compact 7in size is convenient to carry and aligns well with most trim and molding pieces.
• Design guarantees correct reading when reversed, which reduces setup mistakes.

Cons

• Engineered plastic is not as wear resistant as metal, so heavy daily use may show wear over time.

Specifications

Brand	Starrett
Model	505P-7
Material	Engineered plastic
Length	7 in
Scales	Two laser engraved scales (inner and outer)
Intended use	Miter and single cut angle transfer

Our Verdict

The Starrett 505P-7 is a practical, value-oriented angle finder that does exactly what it promises: reliable miter and single-cut readings with a compact footprint. Tradespeople and serious DIYers who want to speed saw setup and reduce waste will find it good value; those needing metal construction or digital precision should look elsewhere.

Frequently Asked Questions

Does the tool work if flipped or reversed?
Yes. The 505P-7 is designed so the reading remains correct whether the protractor is upside down or backwards.

What do the two scales indicate?
The inner scale and miter cut arrow give the correct miter saw setting for jointed cuts, while the outer scale and single cut arrow give the setting for fitting one piece to an angle.

Is the material durable for jobsite use?
It is made from engineered plastic to balance low cost and durability; it is suitable for regular use but is not as abrasion resistant as metal protractors.