Quantitative Quality Indicators
A simple and effective means of establishing adequate level of
magnetization and balance, is with the use of calibrated shims, such
as the "Quantitative Quality Indicators" Tm.  Without their use,  one
direction will overwhelm the field in another direction and result in
uni- directional magnetization, or a resultant field may develop.
note the circular artificial flaw standard to see that a consistent even
pattern is shown on the entire circle. On rings, discs, and any part
with more width or diameter than length, and with a center aperture.
QQI's
QQI #KSCG 230G
.002 X .006" Circle + Cross Shims
QQI #KSCT 234
.002 X .0006" 3 Circles 20-30-40%
QQI #KSC 4-230
.002 X .0006" 4 Miniature
Quantitative Quality Indicators 
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Solid State Systems
Building 103, 9421 Feron Boulavard
Rancho Cucamonga, California 91730
Tel: 1-909-891-0660
Email: contact@sssndt.com