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  • MAG-ic Probe BLE  is powered by USB from a computer or USB Battery Pack
  • MAG-ic Probe measures thickness by the use of magnets.
  • MAG-ic Probe BLE can use Bluetooth LE to display measurements on Smartphones for mobile use.
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  • MAG-ic Probe BLE can use Bluetooth LE to display measurements on Smartphones for mobile use.

MAG-ic Probe BLE Thickness Caliper

Temporarily Sold Out
1.50 LBS

Product Description

MAG-ic Probe BLE for use with Computers!


MAG-ic Probe is an Electronic thickness gauge capable of accurately measuring the thickness of any non-ferromagnetic materials. The primary design is geared toward the Luthier industry. Luthiers create custom wooden musical instruments of all types using great skill and craftsmanship. These instruments range from guitars, mandolins, violins, bass and ukelele and most of them rely on specific thicknesses of the wooden plates that make up the top, sides and back of the instrument. Luthiers use their skill an experience to produce a certain voice or tone from these wooden plates. The MAG-ic probe is designed to assist in measuring these critical thicknesses when other tools do not work or are just too cumbersome. MAG-ic Probe provides an easy and affordable tool that can measure the thickness of large plates and is especially useful for measuring thicknesses on fully assembled instruments. Luthiers also find useful information in measuring thicknesses of vintage or classic instruments. MAG-ic Probe uses magnetism to penetrate the material to be measured. A probe is applied to one surface of the plate and a ball is applied to the opposite side. These attract each other and the MAG-ic Probe tool will measure and display the thickness in both mils (1/1000th inch) and millimeters (mm)

MAG-ic Probe may be used to measure the thickness of any non-ferromagnetic material up to 15mm. This includes Plastics, Aluminum, Copper and composite sheet materials.

NEW!!.....MAG-ic Probe BLE  Delivery varies but can be around 10 days.

MAG-ic Probe BLE is a total re-design and is our smallest version yet but still retains the same probe mechanics and trusted operation.

Some of the New features offered by MAG-ic Probe BLE are....

  • All-in-One design with all electronics inside the handheld probe.
  • Powered by USB cable to a computer.
  • Uses MAG-ic Probe Companion Software to display measurements on a computer.
  • 16-bit A/D converter for added resolution.
  • Lower power consumption.
  • Simplified magnet options.
  • The MAG-ic Probe BLE comes with  -
    • 2 magnets, a 1/2" ball for guitars, plates or any object where access is not restricted and a 1/4" (6.35mm) cylinder magnet which should fit into most f-holes of violins and mandolins.
    • The BLE Probe measuring 2.3" x 0.85" (60mm x 22mm).
    • a USB Cable for Attaching to your computer.
    • a Handy padded storage box.
    • Free Downloadable Software - MAG-ic Probe Lite Software allows you to upload a picture of the instrument or object you are measuring on your computer and record each measurement you make to that picture (See Software section for details). You must add the free software to your cart to be able to download it.
  • OPTIONAL -the MAG-ic Probe PRO Software may be purchased which will allow you to transform your completed measurements into a full-color contour map to instantly visualize your thickness planes. (See Software section for details and videos.)




ALERT!! - MAG-ic Probe is designed to work with a computer running the free MAG-ic Probe Software to record measurements to a picture of your instrument or object. 


Alternatively, a fellow luthier has created a mobile application to display and record measurements on a mobile device for those times you are not near your computer. Search you app store for Magic Caliper


As of this writing, the Magic Caliper app is available for IOS devices but Android may follow soon. Please note that MAG-ic Probe is not affiliated with the developer of the Magic Caliper app.


You can find the Magic Caliper app on the IOS App store at


DELIVERY- Please note that delivery can be up to 10 days depending on current schedule and order demand.

Below pictures and videos may show previous versions of MAG-ic Probe being used. The operation principle and Software remains the same.



Product Reviews

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  1. Great tool in my Guitar Shop 5 Star Review

    Posted by on 30th May 2019

    The Magic Probe Lite has been a very useful tool in my shop. Its easy to use- and it does exactly what it says it does. It has an added advantage over those big (and expensive) callipers in that you can use it on backs and sides of assembled instruments. This makes it indispensable for final thicknessing. Also, the tech support has been excellent and very much appreciated.

  2. Probe review 5 Star Review

    Posted by on 9th Oct 2017

    Very easy to use on assembled instruments. Provides the ability to measure top, back and side thickness in remote areas not easily measured,

  3. Invaluable aid for a violin craftsman 5 Star Review

    Posted by on 26th Jun 2015

    The MAG-ic Probe will be used to measure the thickness along the edge area (concave meniscus) on the violin top,when the violin body is closed.An Equal thickness for mentioned area is crucial for the violin sound quality.
    I think there is no other practical Equipment for this purpose at the moment?

  4. Valuable Tool 5 Star Review

    Posted by on 5th Dec 2014

    I think this is a great tool! It is very accurate and I really like being able to save and print out the findings.
    I'd give it a 5 out of 5
    Thank you

  5. MAG-ic Probe V5.0 Control Unit 5 Star Review

    Posted by on 18th Nov 2014

    I finally finished a guitar and tried out this tool to document the final thicknesses of the top. Wished I had it during construction. The tool is very well made and works wonderfully. It tracks well with the caliper I have been using, but should be more accurate. A caliper is useless once the sides are glued to the top, or when the box is complete and you need to tune, which I always do. I know there is this web site (that's how I find the tool in the first place) but I was expecting some instructions (however brief) with the tool but only a warning came with it. I did not even know the 2nd switch position is for a hold. Luckily the tool guides you, and it's pretty slick. Having used this probe I now consider it indispensable.

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