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Rockler 3-in-1 Bar Gauge

Three sets of interchangeable tips let you check diagonals for square, transfer dimensions, draw perfect circles and more!
Item #
86% of 100

Sometimes the oldest, most basic tools can turn out to be the most efficient ones. Our 3-in-1 Bar Gauge, a refinement of a time-honored cabinetmaker's tool, is certainly one of them. It doesn't quibble over metric or imperial measurements, or even any measurements at all. It simply tells you if your frame, drawer or case is square, or whether the part will fit. It includes three sets of interchangeable tips that let you check diagonals for square, transfer measurements and even scribe circles. All this at a fraction of the price of similar bar gauges on the market. Use commonly available 3/8'' dowel stock (supplied by the user) to obtain whatever length you need for your most typical projects.

(2) Bar gauge assemblies
(1) Set of beam compass tips
(2) Flat tips for transferring dimensions
(2) Angled wedge tips for checking diagonals
(2) Hex wrenches

More Information
Brand Rockler
Weight 0.5500
Tech Spec
  • Sharply angled wedge tips reach into 90° corners and other tight spaces such as 1/4'' drawer bottom dados
  • Beam compass/trammel points tip set works with standard size pencils and pens for scribing circles
  • Flat tips are perfect for transferring dimensions, especially inside dimensions
  • Durable aluminum body
  • Fits 3/8'' diameter wooden dowels or metal rods (not included)
  • Maximum range is determined by rod length
  • Large knurled knobs for easy adjustments
4.3 / 5.0
122 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Bar guage is very useful
I haven't used it in the construction of a project yet but it should work fine. Oak dowels, waxed lightly, slide easily. Suggest two lengths of dowels in order to use the guage in small drawers or other projects.
June 8, 2020
2 months ago
Woodworking Experience:
Great product
great for precise measuring
June 6, 2020
7 months ago
Woodworking Experience:
Works as described
May 21, 2020
7 months ago
Woodworking Experience:
Dave H
exactly what I needed for accurately measuring drawers.
April 19, 2020
4 months ago
Woodworking Experience:
It works very well!, I would purchased it again if needed.
April 7, 2020
4 months ago
Woodworking Experience:
Bar gauge
This sure beats trying to use a tape measure inside a cabinet or window or checking for square.
January 27, 2020
over 3 years ago
Woodworking Experience:
Great measuring tool
Great measuring tool. Works as advertised. Got it on sale. So, it was also a great deal!
December 26, 2019
7 months ago
Woodworking Experience:
For use with this product.Quick and accurate
This tool provides a quick accurate means by which to check the squareness of drawer Bowes and other such projects. I suggest buying aluminum rods For use with this product.
December 24, 2019
7 months ago
Woodworking Experience:
good large radius layout tool
needed to layout turntable pit fotr model railroad
December 24, 2019
7 months ago
Woodworking Experience:
Time saver!!!
I knew these were going to be an awesome tool when I first saw them. Doing a lot of remodeling on my home and these have come in real handy. I bought 2 6' 3/8" solid aluminum rods to measure stud length for built in place interior walls. No more 3 trips to the chop saw! I can't tell you how much time this tool has saved me --- not to mention wear and tear on my legs!! I plan on having several sets of different length bars for use in different situations. Just an awesome tool for any carpenter/builder/cabinet maker/handy man. Would definitely recommend this item to a friend or anyone looking to add a great tool to their box.
December 22, 2019
7 months ago
Woodworking Experience:
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Browse 4 questions Browse 4 questions and 18 answers
Why did you choose this?
Rockler Store
I needed something to take better measurement.
Gabriel S on May 1, 2020
because i need it.
brad p on Feb 26, 2020
I needed something to take better measurement.
Gabriel S on May 1, 2020
more accurately measuring inside cabinet boxes and other tight spaces.
Michael S on Apr 5, 2020
because i need it.
brad p on Feb 26, 2020
Always looking for ways to speed things up - this seems like it will aide in that quest!
Jonathan R on Jan 10, 2020
I need to accurately measure between two surfaces that a tape measure can’t do.
Eric M on Dec 15, 2019
special Christmas request from my husband... (Who never has any ideas for me!!)
JANA on Dec 9, 2019
excellent radius measuring
ROBERT D. on Nov 29, 2019
More accurate than tape
Maurice G on Nov 28, 2019
Need a quick reference measurement tool.
WILLIAM T on Nov 27, 2019
Looks pretty useful and well thought out.
MICHAEL G on Nov 27, 2019
I can't get an accurate inside dimension with a metal tape measure & looking forward to using this gauge to get an exact distance
Harvey on Nov 27, 2019
Simple effective product and on sale.
STAN P on Nov 27, 2019
This looks like a great tool that can be used for any length of measurement as long as you have a dowel or rod to suit the job at hand. I especially like the ability to draw large circles with the added compass feature.
Jody R on Nov 27, 2019
I wish I had this long time ago,for all my drawers build.
Ricardo on Nov 27, 2019
Have use for it
James O on Nov 27, 2019
Good price.
Ron F on Nov 26, 2019
Harry N on Nov 25, 2019
special pricing
Allan L on Nov 25, 2019
Christmas present for my father in law
Yvonne B on Nov 24, 2019
Looks like it will save time and accuracy confirming inside measurements and creating accurate circles.
Randy L on Nov 24, 2019
Versatility, something I will use often
merlin l on Nov 24, 2019
For inside measurements.
Jerry on Nov 15, 2019
for bookcase squaring of sides..
donald l on Nov 15, 2019
Accurate of measurements
Gary on Sep 16, 2019
I've found that it's a necessary tool in my shop
Rebecca M on Aug 29, 2019
Above ground fuel storage tank manufacturer. Lay out many circles and arcs.
Kevin P on Aug 23, 2019
current promotion
Brad H on Aug 23, 2019
i make stained glass windows and panels and will use this to help with frame layout to make sure they are accurately measured and square. I can also use this in the design and drawing process with the pencil attachment. My husband and I do some woodworking and will also use this tool for accuracy on those projects
DONNA P on Aug 23, 2019
A friend has these and I thought that it would be handy for me. I bought 3/8 aluminum from Menards for the rods.
Mark on Aug 16, 2019
I chose this item to transfer dimensions from one cabinet to another.
John C. M on Aug 11, 2019
Been wanting one for a while to help with the varied projects. It was on sale and picked it up. Looking forward to getting many years of use out of it.
Duston on Aug 4, 2019
Like my others and wanted two more. Easy to eliminate measurement errors.
Tommy on Jul 3, 2019
I've put off making one for too long; this will motivate me to get it done.
Chris K on Jan 22, 2019
To make life easier while laying out the arch of Adirondack Chairs.
Jeffrey H on Dec 27, 2018
best way to measure front and back inside measurements of cabinets. Also great when working with window dimensions.
freshh20 on Nov 9, 2018
Have a few projects involving cabinets and drawers, with face frames. With good reviews I am hoping this helps improve speed and accuracy.
Alex (DIY/Maker) on Sep 17, 2018
Needed this for setting drawer slides.
Howard S on Jul 5, 2018
Good American Quality
Ashley B on Jun 26, 2018
needed to get simple tool to check square of drawers
Samuel on Jun 8, 2018
Should be more accurate then a tape measure and can be locked down for multiple checks.
Shawn A on May 14, 2018
More accurate for all measuring job
Chan W on Apr 28, 2018
More accurate with uneven walls
Donald B on Apr 17, 2018
Wanted one
Mike on Mar 27, 2018
This looks like a time saving tool for a multiple jobs, anixous to try them out!!
Mickey on Feb 28, 2018
Looks easy to check how square my boxes are
Steven G on Dec 23, 2017
husband marked for Christmas list
Susan E on Dec 7, 2017
Been looking for one for several years. Does not seem to be in the bi-monthly catalogs.
Paul T on Nov 29, 2017
It was a requested gift.
Sherry M on Nov 29, 2017
I've wanted these forever, these look to be one of the handiest helpers in the shop. No more checking measurement a half a dozen times, and for me making circles will be a little easier. Can't wait to try them. Thanks Rockler
David S on Nov 8, 2017
Need something to take accurate measurements inside of cabinets for drawer slide installation.
Bart B on Nov 2, 2017
more accurately measuring inside cabinet boxes and other tight spaces.
Michael S on Apr 5, 2020
Always looking for ways to speed things up - this seems like it will aide in that quest!
Jonathan R on Jan 10, 2020
Where can you purchase the 3/8 aluminum rods?
Gerald G on Sep 5, 2015
BEST ANSWER: Home Depot, Lowe's and any metal supply store or outlet.
Are the tips aluminum or plastic
Michael on Feb 27, 2016
BEST ANSWER: The tips at the ends are plastic - to accommodate a pencil on one end and the center point piece on the other end - whereas the blocks for adjusting the length (blue parts in the middle) are aluminum.
What is the maximum extension of this tool?
Darrell T on Jan 30, 2017
BEST ANSWER: Since you provide the bars, there is theoretically no limit. I bought long aluminum round stock and cut them down so I have a long set for cabinets and a small set for boxes and drawers. I keep them set up with the shorter rods because that is what I need more often; it is quick to change if I want to square a cabinet.
Screws for accessory tips are too short. I'll get longer ones. They seem to be a #8 screw. True or are they metric?
Joe S on Sep 14, 2016
BEST ANSWER: It has a #8 UNC thread... they are NOT metric.
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