Stainless steel weld ferrite-content magnetic gauge
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Magnetic lift-off gauge used in welding QC to measure ferrite vs. austenite percentage in stainless steel welds.
In welding of stainless steel we have gauges, which are nothing more than a little magnet on a little beam-weight balance, and you measure the lift-off force. Based on the lift-off force, you can tell what percentage is ferritic stainless steel and what percent is austenitic stainless steel — two different crystal structures. We actually use that property in specifications for making stainless steel welds. All I'm trying to illustrate is different properties.