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Multi-word Results
| crystal detector |
a simple radio receiver made of a semiconducting crystal touched by a fine wire. |
| lie detector |
an instrument that tracks a person's vital signs and records changes in them as a measure of the truthfulness of the subject's statements while being tested; polygraph. |
| metal detector |
a device that detects and signals the presence of metal objects and is used to discover concealed weapons at a security point or locate buried coins and the like. |
| mine detector |
a device used for finding hidden explosive mines. |
| smoke detector |
a warning device that emits a loud signal when it detects the presence of smoke or heat. |
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