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Besides just measuring 45° and 90° like a combination square, the Penta Square also measures 22.5° and 60°.  But, that’s only four measurements; penta is a prefix for five. Either they’re considering 180° a measurement, or else they’re call it that because of the irregular pentagon-shaped body.

Kapro etches the 12″ stainless-steel blade in both Inch and Metric graduations. The bubble vial rotates within the body to check level and plumb in “all” positions. Absent is the thumb screw locking mechanism of a normal combination square. They’ve replaced it with their EasyLock mechanism, which they neglect to show in the literature.

Depending on where you look, the Penta Square could cost you as little as $6.

Penta Square [Kapro]
Penta Square [Woodworker’s Supply]
Via Amazon [What’s This?]

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6 Responses to The Penta Square

  1. Jim says:

    I can see from the picture that it can measure and angle >90. Maybe, 120? So, that is a fifh angle.

  2. CK says:

    142.5 degrees? Not sure why that would be the 5th angle. 72 or 144 would be more Penta.

  3. David Bryan says:

    There’s more information in the U.S. Patent Application: http://www.freepatentsonline.com/y2002/0088130.html
    and the U.S. Patent: http://www.freepatentsonline.com/6553677.html
    You’ll need to log in to see the pdfs of the actual application and patent, but that site is really interesting.

  4. shopmonger says:

    Do we really need another Square……


  5. bigboom101 says:

    If you rotate this square 90 degrees to the left the 60 becomes a 30. you can also use the level as a 30 by just putting it on the top of the board instead of the bottom.

  6. Amclaussen says:

    While the Stainless Steel blade is of quite good quality and finish, the plastic pentagon body is not as good: mine came with one of its halves badly warped. It seems that the plastic needs more fiber filler content (most automotive parts made with Fiber Reinforced Nylon contain at least 30% fiberglass, and they very rarely distort, even with large temperature variations).

    Perhaps KAPRO needs a better group of engineers at their design offices (if they are not already sub-contracting the entire design to China!).

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