alpha-tester
/ˈalfəˌtɛstə/noun
1 Electronics. An instrument for ascertaining the ratio of the change in collector current to the corresponding change in emitter current in a transistor in a common-base configuration (the common-base current gain, symbol α). Now disused.
2Chiefly Computing. A person who performs alpha tests.
Origin
1950s. From alpha + tester; in sense 1 with allusion to α as a symbol for current gain in a transistor.
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