does this tool work so that you can get an angle and then it will let you know the degree on saw?

that's what it is designed to do, so yes if apply it to the angle you want to cut you just have to make the cut at that angle

Will this lay flat on a table, even with the wing nut?

The square head will lay flat on a table surface, the square head measure read plate is 1.22mm or 3/64'' thick thus leaving the measure indicating arm that much above the surface.Hope this answers the question and is helpful. Oscar

Are the edges of the protractor rectangular plate with the graduation truly square?. Can you use any edge adding 90 degrees when using the sides?

First question answer is yes, I checked mine at 90 degrees and 45 degrees. Second question answer yes, I have drawn two lines parallel using each side of the protractor arm. The markings run left to right to left and left to right on two levels. Trust this explanation has answered your questions.

What are the dimensions of the bar... ?

The bar, from the pivot point to the extremity is 150 mm long, 15 mm wide and about 1.5 mm thick made of stainless steel The angle measuring plate measures 90mm by 52mm.

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General Tools Square Head Protractor & Angle Finder for Carpentry & Framing

Product ID: 860694

Details

Brand
General Tools
Color
Stainless
Material
Stainless
Product Dimensions
8"L x 2"W
Style
Square Head

📏6" adjustable stainless steel arm

🔩Knurled thumb nut locks angle securely

🛠️0-180° dual-direction semi-circle scale

EC$95

Duties & taxes included

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Sold byAmazon Saint Vincent and the GrenadinesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

📐 Measure smarter, build sharper — don’t let your angles hold you back!

BUILT TO LAST - Durable stainless steel construction ensures this protractor withstands the toughest job sites and DIY projects.
VERSATILE ANGLE MASTERY - Measure angles from 0 to 180 degrees forward and reverse—perfect for carpentry, framing, and machining.
THE ULTIMATE DIY ESSENTIAL - From custom furniture to framing, this tool is your go-to for professional-grade precision and craftsmanship.
ERGONOMIC SQUARE HEAD DESIGN - Anchors firmly against surfaces for stable, hands-free angle measurement and transfer.
PRECISION AT YOUR FINGERTIPS - Lock in exact angles with the rust-resistant knurled thumb nut for flawless cuts every time.

The General Tools Square Head Protractor & Angle Finder is a stainless steel precision tool featuring a 6-inch adjustable arm and a 0-180° dual-direction scale. Designed for carpenters, framers, and machinists, it locks angles securely with a knurled thumb nut and anchors firmly with its square head, enabling accurate angle measurement and transfer for woodworking and construction projects.

Specifications

ASIN	B00004T7TB
Best Sellers Rank	#21,453 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #9 in Construction Protractors
Brand Name	General Tools
Color	Stainless Steel
Customer Reviews	4.5 4.5 out of 5 stars (2,892)
Global Trade Identification Number	00038728220189
Included Components	STEEL PROTRACTOR
Item Dimensions L x W	8"L x 2"W
Item Highlight	Carpenter square & angle gauge for woodworking. Angle finder tool & machinist square for framing & angle measuring.
Item Type Name	Square Head Angle Protractor
Item Weight	2.24 ounces
Manufacturer	General Tools
Material Type	Stainless Steel
Model	17
Number of Items	1
Part Number	17
Style Name	Square Head
UPC	043985291384 735090080136 038728220189 732233471196 079531644847 796084346041 752913196263
Unit Count	1 Count
Warranty Description	Manufacturer

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TrustScore 4.5 | 7,300+ reviews

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The product quality is outstanding. Exactly what I needed for my work.

1 month ago

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EC$95

Duties & taxes included

In stock

Sold byAmazon Saint Vincent and the GrenadinesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Saint Vincent and the Grenadines.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Rajesh P.

Customer service was outstanding when I had questions about the product.

2 days ago

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Very impressed with the quality and fast delivery. Will shop here again.

4 days ago

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