Heathkit Transistor-Diode Checker Model IT-27 Assembly Manual

Heathkit Transistor Tester Model IT-27 - Used

Vintage Sencore Transistor Crystal Diode Checker Model TDC22 [Untested]

Heathkit Daystrom Model IT-10 Transistor-Diode Checker Unmodified Vintage

Heathkit Transistor Checker Kit Model IT-18 Tester Vintage Untested IT18

Heathkit IT-27 Transistor and Diode Tester -

Radio Shack Micronta 22-024 Transistor Checker - Vintage - Made in Japan

HEATHKIT MODEL IT18 IN CIRCUIT/OUT CIRCUIT TRANSISTOR TESTER SOLID STATE.