Starrett 12" Professional Protractor for Accurate Measurement and Site Layout

By: Starrett

The Starrett 12" Pro Site Protractor is one of the best Construction Protractors on the market. It offers great value for money, accuracy, and overall satisfaction. The protractor is made from 1/4-inch thick aluminum alloy, making it incredibly durable and long-lasting. It also features two cut scales that meet a variety of measurement requirements. Plus, the Teflon O-ring helps ensure a smooth and precise operation.

Key Features:

This 12-inch Miter Saw Protractor is a durable and reliable tool for any job site. It is made of 1/4-inch thick aluminum alloy, making it ideal for tough cuts. The protractor has two scales – a red "Miter Cut" scale and a blue "Bevel Cut" scale – for making precise cuts. It also comes in a 7-inch version for smaller projects. This pro site protractor is a must-have for any DIYer or professional carpenter.
95
B2B Rating
385 reviews

Review rating details

Value for money
88
Overall satisfaction
85
Easy to use
93
Easy to read
90
Design
85
Build quality
86
Accuracy
90

Pros and Cons

Pros
  • Comes with two cut scales that meets varied measurement requirements
  • Made of 1/4-inch thick aluminum alloy that offers a n extended durability
  • Features Teflon O-ring that helps in a smooth and precise operation
Cons
  • May not adequately calibrated

Details of Starrett 12" Professional Protractor for Accurate Measurement and Site Layout

  • Department ‏ ‎: Unisex Adult
  • Construction Protractors: Construction Protractors
  • Is Discontinued By Manufacturer ‏ ‎: No
  • Item model number ‏ ‎: 505A-12
  • Customer Reviews: 4.7/5 stars of 1,080 ratings
  • Product Dimensions ‏ ‎: 0.79 x 6.85 x 15.24 inches; 1.44 Ounces
  • Date First Available ‏ ‎: January 1, 2008
  • ASIN ‏ ‎: B0000DCBLW
  • Manufacturer ‏ ‎: Starrett
  • Best Sellers Rank: #76 in Construction Protractors

Comments

Jesús: Funciona bien

Spain on May 05, 2023

carlos hector: ok

United States on Feb 08, 2023

Gordon: Like a treasure hunt to find it

United Kingdom on Dec 26, 2022

MarcMarc: Der Schnittwinkelmesser ist schon ein cooles Werkzeug, egal ob für Innenwinkel oder Außenwinkel.

Den Winkel abgreifen und die Einstellung für die Gehrungssäge einfach ablesen, Maschine oder Handgehrungssäge einstellen und fertig ist der perfekt passende Gehrungsschnitt.

Beispiele:

Außenecke = 90°

Single Cut: 0° (Maschine bleibt in Grundstellung = kein Gehrungsschnitt; siehe dazu Fliesenbild, 2 x Single Cut)

oder

Mitter Cut: 45° (Maschine auf 45° einstellen - Gehrungsschnitt, ohne Bild)

Innenecke: 90°

Mitter Cut: 45°; siehe dazu das Fußleistenbild, 2 x Gehrungsschnitt 45°

Vorsicht, dieses Werkzeug ist kein Winkelmesser im üblichen Sinn. Es ist nur für die Schnittwinkelbestimmung gedacht.

Einziges Manko: Ein in Deutschland vertriebenes Werkzeug sollte bzw. muss eigentlich eine deutsche Anleitung dabei haben. Dem ist leider nicht so.

Trotz allem, Kaufempfehlung!!

Germany on Apr 02, 2022

Adam: Mycke bra och hög kvalité!

Sweden on Feb 09, 2022

Shaun: Tricky one to review fairly but will do my best. Firstly, nice and solid. Perfect length as you can get it into tight spaces and I want to cut an angle for the corner, not a foot away from it. You can use an Allen key to adjust the tension if required. The scales are laser cut on an adhesive aluminium panel.

Ok, accuracy…. If I align the two scales up together, there bang on. If I line the single cut to zero, the miter cut shows 44.95 ish. On a sheet of glass, miter shows zero and single cut shows 89.9 ish. The scales are in 2 degree increments. An external 45 is perfect with the zero. Work that one out!

To me, it makes no difference, internal 45 degree mark on the miter cut scale equates to < 2mm deviation at the end of one arm. Makes plasterers look good.

So it depends on what you need. Digital would be more accurate, but the battery is always flat and they’re fiddly.

Yes they are expensive, but there is nothing better on the market for the time they save and the ease of use.

They are an angle indicator, not a gauge but perfectly adequate for most jobs. And accurate once you get to know its little quirks.

United Kingdom on Apr 29, 2016

Aviator: Solid and precise tool. Invaluable for wall moldings such as chair rail and baseboard. Very nicely made and worth having the aluminum over the lesser solid plastic option.. My only wish is that it gave absolute wall angles as well on the reverse side (which is blank). This tool only gives degrees for single or dual (miter) cut angles for your trim work. But if you want to use it purely as a protractor to measure the wall angle, it is not as useful. (For example, if you place it up against a 120* wall, it does not have any indication on the markings for 120*, it instead gives you 2 different cut options for single or dual cuts to fit trim into that 120* wall angle, but will not display in anyway the absolute angle of the wall at 120*.

But it does exactly what it advertises for cuts, and does it very well. Just beware if you are looking for a simple angle measuring protractor that give absolute values of a wall angle (which is needed frequently for tables or apps that solve for crown molding cuts - where you enter the spring angle of the crown and the absolute wall angle and it gives the miter and bevel settings for your miter saw to cut crown molding)

United States on Sep 17, 2014

Catmandu: This is a great tool to have in your shop, but nearly everyone has said that. I wanted to address the accuracy, having read many of the less-than-stellar (and older) reviews on the topic. The comments mostly singled out the degree wheel decal being mislocated, leading to offset errors varying from a half-degree to more than a couple. I decided to buy anyway, based on the updates that said returning a bad one usually resulted in getting a better/good one.

When the packaging for my recent purchase included a bold sticker, "New! Laser accuracy!", I expected to see degree marks laser engraved into the metal, but it had the same basic construction as used for years: an opposing set of printed plastic appliques.

I called Starrett to challenge their marketing claim, but the Engineer stood up to it. He said that laser tooling is now used in the placement of the marks. I didn't grill him to learn whether they use a laser index to apply the same pre-printed decal, or if the marks are printed onto the decal matrix using a laser printing process after it is affixed.

Either way, they have apparently taken a technological step toward putting the accuracy issues behind them....

United States on Jul 03, 2013

Kindle Customer: This is just a very nice tool, well made, hefty, comes with a carrying pouch for protection and it has that "old school" feel, not some flimsy cheapo tool.

This protractor is a solid tool, accurate, and a pleasure to use. I use it for setting table saw fence and miter gauge alignment, and I check the lineup of my Festool MFT track, and any angle that needs stetting I always check for square and with this Starrett 4041-12 it is a snap. I keep it within reach and always verify my setups. There nothing better than knowing that you are dead on every time.

I have other devices that serve the same function, even digital ones but tins is the one sitting right where I am working, always, and I trust it implicitly it does not let me make mistakes. I think one reason that I choose this is that it just feels right in your hands the movement is firm and smooth and you know you can trust it.

Although the movement is quite firm and retains it's setting well, it can be prone to accidental movement as there is no physical lock so you need be careful if you are taking the measurement to another place, this is not a problem as it holds the setting as long as you don't somehow...

United States on Jan 16, 2012

J. Hruby: Look, let's be blunt. No matter how good your hotshot framing and drywall crews are, even new construction is never square. And in old houses, it just gets worse. And this doesn't even take into account irregular angled walls that are anyone's guess.

Now I know the rest of you all payed attention in 8th grade geometry, but for those of us who don't like mulling over math problems on the job site, the Sarrette is as good as it gets. Read the single cut angle off one side. Read the miter cut off the other.

And the tool can (and should) be used to set your miter saw to the exact angle you need. Read it off the wall, set the blade using the tool, cut. Perfect.

Oh, the pain I could have saved myself if only I'd bought one of these earlier. Cutting scrap test pieces and banging my head against the wall wondering how I'd gotten it wrong again.

Basically, if you do a lot of finish carpentry, having one of these will save you a lot of time and money. Even for the homeowner that's doing a few rooms, it's probably worth it if you want really good joints, especially in an old house where most of your "90 degree" corners will be off by several degrees from...

United States on Jan 25, 2007



Starrett 12" Professional Protractor for Accurate Measurement and Site Layout LEXIVON Aluminum Miter Saw Protractor - Precisely Measure Angles for Accurate Cuts First Aid 12" Goniometer - 360 Degree ISOM Measurements for Accurate Readings
Starrett 12" Professional Protractor for Accurate Measurement and Site Layout LEXIVON Aluminum Miter Saw Protractor - Precisely Measure Angles for Accurate Cuts First Aid 12" Goniometer - 360 Degree ISOM Measurements for Accurate Readings
B2B Rating
95
98
96
Sale off $20 OFF $1 OFF
Total Reviews 385 reviews 484 reviews 230 reviews
Department ‏ ‎ Unisex Adult
Construction Protractors Construction Protractors
Is Discontinued By Manufacturer ‏ ‎ No No
Item model number ‏ ‎ 505A-12
Customer Reviews 4.7/5 stars of 1,080 ratings 4.7/5 stars of 6,616 ratings
Product Dimensions ‏ ‎ 0.79 x 6.85 x 15.24 inches; 1.44 Ounces 12.3 x 4.7 x 0.1 inches; 2.4 Ounces
Date First Available ‏ ‎ January 1, 2008 May 27, 2016
ASIN ‏ ‎ B0000DCBLW B01G9AR62O
Manufacturer ‏ ‎ Starrett Ever Ready First Aid
Best Sellers Rank #76 in Construction Protractors #4,499 in Tools & Home Improvement #1 in Miter Saw Accessories#3 in Construction Protractors
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