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Hi Bev,
Based on Dave's input, this might be what you are looking for. They speak of
a lolly pop pad for checking wetting, which could possible be considered by
analogy as a thermometer.
Best,
Joe
United States Patent 5,827,951
Yost , et al. October 27, 1998
Solderability test system
Abstract
A new test method to quantify capillary flow solderability on a printed
wiring board surface finish. The test is based on solder flow from a pad onto
narrow strips or lines. A test procedure and video image analysis technique were
developed for conducting the test and evaluating the data. Feasibility tests
revealed that the wetted distance was sensitive to the ratio of pad radius
to line width (l/r), solder volume, and flux predry time.
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(http://living.aol.com/video/how-to-please-your-picky-eater/rachel-campos-duffy/
2050827?NCID=aolcmp00300000002598)
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