Verificarea continuitaţii unor circuite sau chiar a unor rezistoare se poate face şi folosind un instrument cu indicaţie sonoră cum este cel din fig. 61.
Acesta este de fapt un oscilator care primeşte alimentare tocmai prin rezistorul ce urmează a fi verificat şi care se cuplează la bornele AB. Tonul generat este în funcţie de valoarea rezistorului. Se pot măsura rezistoare cu valoarea maximă de 1,5 MΩ.
Tranzistorul T este de tip AC125, EFT353, EFT323 etc., iar dioda D este EFD108,. Transformatorul de ieşire Tr este de tipul celor utilizate la aparatele de radio „Mioriţa” sau „Mamaia”, iar difuzorul este tip miniatură cu impedanţa bobinei mobile de 4÷8Ω.
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