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Logic probe
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<p>A logic probe is a low-cost hand-held <a href="/facts/Test_probe/1LRc6d2t">test probe</a> used for analyzing and troubleshooting the logical states (<a href="/facts/Boolean_logic/VkCToAmg">boolean</a> 0 or 1) of a digital circuit. When many signals need to be observed or recorded simultaneously, a <a href="/facts/Logic_analyzer/uqjrQdUp">logic analyzer</a> is used instead. </p>