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Hi, Carla,

The reference I have used for years is:

www.mrltapes.com/field-strength-for-partial-erasure.pdf

I bought a one-piece 3-axis meter for about $150 from these folks about 
a decade and a half ago.

http://www.lessemf.com/gauss.html

This looks like a good choice at $150

XYZ Axis EMF Tester (Cat. #A194)

However, the unit I have I think goes out to higher harmonics which 
might be interesting with large three-phase power installations, so 
another choice on the same page for $269, but it may be overly sensitive 
and not be able to measure higher strength fields discussed in the paper.

3-Axis Backlight Gaussmeter (Cat. #A107)

For $300 it looks as if this might be closest to what I had and found 
most useful.

Switchable 1:3 Axis Gaussmeter (Cat. #A153)

Though for $200 you can get this:

Datalogging 3-Axis Gaussmeter w/ PC (Cat. #A494)

Cheers,

Richard




On 7/18/2016 9:59 AM, Carla Arton wrote:
> Hello all,
>
> Our processing area is being temporarily relocated next to some breaker
> boxes and I wanted to make sure there wasn't a magnetic field from those or
> other things in the work space that could affect any video or magnetic
> audio we are processing.
>
> What is the threshold we should be concerned about if we were to get a
> magnetometer out there to test the space? A link to a resource about this
> topic would be greatly appreciated as well.
>
> Thank you in advance,
>
> Carla
>
> --
>
> Carla Arton
>
> Film Digitization Specialist
>
> Indiana University Libraries Moving Image Archive
>
> [log in to unmask]
>
> 812-856-7083
>
-- 
Richard L. Hess                   email: [log in to unmask]
Aurora, Ontario, Canada                             647 479 2800
http://www.richardhess.com/tape/contact.htm
Quality tape transfers -- even from hard-to-play tapes.