Magnet Polarity Tester

  • 30 Reviews
  • Write a review

Refined by Les Schatten especially for guitar shops, this tester is useful for troubleshooting and testing pickups and wiring.

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Magnet Polarity Tester

Item # 5127
In stock, ready to ship!


Total: $0.00
Quantity: 20


Refined by Les Schatten especially for guitar shops, this tester is useful for troubleshooting and testing pickups and wiring.

Pickup rewinding specialist J.M. Rolph has noted, "How many times have you wired a pickup and found it's magnetically out of phase, with the same thin, low-powered sound as a pickup that's wired out of phase, even though the lead wires looked right?" By indicating the north or south magnetic orientation of a pickup's polepieces, this polarity tester can help you avoid the problem.

With a basic knowledge of vintage pickup magnet polarities (instructions are included), this tool is also a quick way to determine a pickup's authenticity.

Trade Secrets! Newsletter

How to open a humbucker and reverse the polarity

Erick answers a customer question about reversing a humbucker's pickups, and finds that the hardest part is getting the cover off the pickup!

Product Instructions

Schatten Magnet Polarity Tester

Jim Rolph explains the importance and use of the Schatten Magnet Polarity Tester.

Ratings & Reviews

Magnet Polarity Tester

  • Based on 30 Reviews
Displaying 2 of 3 1 2 3
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Another cool tool from Stew Mac!

By Dave M from Los Angeles, CA USA
(Customer's Reviews) Tuesday, August 14, 2012

Like the title said, it's a great tool to have in the shop. Quick and easy to use and a great time saver. Thanks Stew Mac, you ROCK!

Opposites Attract

By Gibson Paul L. from England
(Customer's Reviews) Sunday, August 05, 2012

Very handy bit of kit if you are making or repairing pickups.

Time Saving Tool

By Eastbville from Bartlesville, OK
(Customer's Reviews) Wednesday, July 18, 2012

I repair pickups and wind new ones in my repair shop. This easy to use tool saves me time in determining south or north up. I even had a factory pickup that the magnet was installed in reverse to the intended specs. The guitar's tone was odd/out-of-phase and I checked the polarity first off to find the problem. This purchase has been an important shop aid for me.

Simple and effective

By abrigo ohana from hawaii
(Customer's Reviews) Thursday, April 19, 2012

The magnet polarity tester was extremely simple to use. It made magnetizing my 2 Rickenbacker horseshoe pickups a breeze.

Good, Cheap, Why Not?

By Guitartec from Coventry, RI USA
(Customer's Reviews) Sunday, March 04, 2012

I finally purchased this after looking at it for years in the catalog. Now I'm kicking myself for not buying it sooner. We use it ALL the time at my shop.


By Diego from Terni, Italy
(Customer's Reviews) Monday, November 07, 2011

...I can't live without...

too simple

By zapkat from Sierra Vista, AZ
(Customer's Reviews) Sunday, October 30, 2011

I purchased two of the Magnet Polarity Testers. One for me and one for a friend of mine who is also a real luther. He taught me every thing I needed to know to be able to maintain my guitars. The one thing we could never figure out was the polarity of the pickups. Just because the color code of the wires is correct,it dosent allways work the way you wanted.

The Magnet Polarity Tester is so simple to use, and no guessing if the Polarity is correct. If you are going to do any rewireing or pickup changes, you will know if you got it right or not, with the Magnet Polarity Tester.

Thank You STEWMAC for a Great,easy to use product.


By Tomy from Becancour, Qc, Canada
(Customer's Reviews) Saturday, July 09, 2011

Very useful and works perfectly.

Polarity Tester

By Hawwkeye from Portland, Me.
(Customer's Reviews) Sunday, July 03, 2011

Smart and to the point. great tool! Thank you stew Mac. Very speedy standard shipping.

A quick helper

By Julyan Wallis, Guitar Doctor / J Gu from Cornwall, UK
(Customer's Reviews) Wednesday, May 04, 2011

Conveniently small and accurate, one of those I wish I had thought of that tool!

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Shown on page 50 of our latest catalog.