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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 #
88% 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
4.4 / 5.0
97 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
coming in go.
November 21, 2019
over 3 years ago
Woodworking Experience:
Thank you very much
October 3, 2019
3 months ago
Just used the bar gauge for measuring inside a newly framed window. Measurements were exact. Very easy to use. Wish I’d had this for building drawers into old, uneven, shop space! Would definitely recommend!
September 29, 2019
2 months ago
Helpful little tool!
It's one of those jigs or measuring tool which makes you hit your forehead saying, "why didnt I thi k of that?" I could make one, but for the price, Rockler has one I can without rumaging through my scrap bin. Make cabinet face frames and drawer/door distances much easier to measure. Thx Rockler!
September 15, 2019
2 months ago
Woodworking Experience:
Good product
July 4, 2019
5 months ago
Woodworking Experience:
I makes measuring so much easier!
April 24, 2019
8 months ago
Woodworking Experience:
S&G Mill Work (Bar Gauge Review)
Good Quality and Accurate tooling
February 28, 2019
9 months ago
Woodworking Experience:
simple and effective
Such a small thing made a giant difference in work accuracy for double checking for square and especially internal measurements... i love it
February 23, 2019
9 months ago
Woodworking Experience:
Nice Product
I was using a tape measure to check the square on cabinets and such, and I had been using a board with a nail on one end and a series of holes for a pencil to mark large curves. This device does it all, and is much easier and more convenient to use.
December 30, 2018
11 months ago
Woodworking Experience:
Just the ticket
Works like a charm for fitting cabinet drawers.
October 4, 2018
1 year ago
Woodworking Experience:
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 5 questions Browse 5 questions and 68 answers
Why did you choose this?
Rockler Store
For inside measurements.
Jerry on Nov 15, 2019
Accurate of measurements
GARY B on Sep 16, 2019
For inside measurements.
Jerry on Nov 15, 2019
for bookcase squaring of sides..
donald l on Nov 15, 2019
Accurate of measurements
GARY B 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
patrick m on Sep 14, 2017
I needed a replacement for my trammel points and this was even better.
douglas k on Sep 1, 2017
David S on Jul 11, 2017
for easy measuring inside boxes. very accurate. love it
Theresa M on Mar 23, 2017
measuring inside draws to check for square and drawing large circles
Kevin H on Mar 7, 2017
Because it was a beautiful blue.
Danny H on Mar 3, 2017
home projects
Clarence L on Mar 2, 2017
looked useful
Keith B on Feb 20, 2017
I needed this for accurate inside measurements for drawer bottoms
Allyn B on Feb 15, 2017
handy to have.
Roy W on Feb 8, 2017
In the process of building some cabinets and drawers and I think this item will help.
Danny M on Feb 6, 2017
Needed to very accurately measure odd interior spaces in cabinets, hatches, odd angled bulk heads and such in marine applications. Great toy. Solid and more accurate than a tape or ruler. You may only use it 3 times a year, but when you need it, you need it.
Chris K on Feb 4, 2017
so simple, but struggled with doing this repeatedly with several different work arounds
Eric B on Feb 1, 2017
Helps with measuring drawer bottoms with dados.
Martin K on Jan 31, 2017
Wanted this for quite a while when it went on sale.
Leo T on Jan 14, 2017
Hi Rockler has the best tool,s I love Rockler products
Michael T on Jan 6, 2017
More accurate than my home made one
Robert R on Jan 5, 2017
Replacing my shop built not so good one
Charles E on Jan 5, 2017
Helps in makin accurate drawers and various other projects.
Howard K on Jan 4, 2017
to help in building cabinet drawers
Curtis J on Jan 4, 2017
Going to use to determine width of drawers to build to fit in a case
Douglas S on Jan 2, 2017
for bookcase squaring of sides..
donald l on Nov 15, 2019
I've found that it's a necessary tool in my shop
Rebecca M on Aug 29, 2019
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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