Part# 12-16901
MFR Model# 22095


This INDUCTOR Magneto Timing Device is a new concept utilizing the latest digital integrated circuitry, thus eliminating the need for the battery draining mechanical buzzer found in most of the older magneto timing lights. The timing indicators are light emitting diodes (LEDs) rather than the commonly used incandescent bulbs, further extending battery life. Since the device measures change of inductance in the magneto coil, it will not give a false reading should the clip leads pop off or become shorted. The INDUCTOR can also be used as a relay coil tester to determine whether the coil is functioning.

One of the INDUCTOR's most convenient features is its compact size. It measures .75 by 3 by 5 inches and is packaged in an anodized aluminum case that will neither melt nor break. It fits into the mechanic's tool box or shirt pocket and weighs only nine ounces.

The INDUCTOR is powered by a 9-volt Duracell battery. With the inherent low power drain of the device and prudent use of the on-off switch, the battery should function for as long as its shelf life. If the LEDs fail to toggle when the magneto points open or close, it is an indication that the battery needs changing.


  • Model: Dual magneto synchronizer with four phase audio signal
  • Latest digital integrated circuitry
  • Bright L.E.D. read-out
  • Color coordinated leads to L.E.D.'s
  • Electronic tweeter provides additional audio indication of operation
  • Compact Size: .75 x 3 x 5 inches
  • Magneto leads four feet long
  • Measures change of induction in oil
  • Long battery life
  • Strong anodized aluminum case
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would recomend to anyone

Art S Verified Purchase


October 10, 2021

great product

Rodney N
October 20, 2020

Worked great! Only issue was that it arrived with the switch on and battery was dead.

September 20, 2020

Works without issue. And even came with an alkaline battery pre-installed.

Todd L
March 20, 2020

Worked perfectly.

March 16, 2020

Worked perfectly.

February 24, 2020

Worked great and as advertised❗️Tweeter loud enough that this old guy with two hearing aids no problem❗️😉

Jim B
January 31, 2020

Works perfect, small and compact. The tone it makes is still fairly annoying, but easy enough to turn on and off. The leads seem cheap and has small alligator clips.

January 19, 2020

Ready to go, got er done.

William T
August 8, 2019

A good unit as I used this in school for getting my A&P license. A little pricy for such a simple device.

Harold T
April 26, 2021


Please note, Aircraft Spruce Canada's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce Canada assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: What are the differences between this the industrial and the ATS ones that you have available?

The ATS one has the buzz alarm.

Q: Can this duel mag tester be used on a single mag system?

Yes this can be used to time a single mag.

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