spot chex

spot check

noun
a random sampling or quick sample investigation: A spot check showed that at least ten percent of the items were defective.

Origin:
1940–45

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
spot check
 
n
1.  a quick random examination
2.  a check made without prior warning
 
vb
3.  (tr) to perform a spot check on

Collins English Dictionary - Complete & Unabridged 10th Edition
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