Using an immersion plating system, at the recommended amps per sq inch, temp etc. most of our systems will plate at 1/1000" per hour. So, the time element will give you a fair idea of thickness without measurement.
Alternatively, a micrometer reading before and after is ideal.
As for measuring brush plating, - thats very hit and miss! By it's nature, brush plating will simply not give you an even thickness, too many variables. How can you control an even accurate brush stroke over an entire area? Impossible.
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