Heathkit Transistor Tester Model IT-27 - Used

Heathkit Transistor - IT-27 Vintage Diode Checker Model IT-27, Untested

IT-18 Heathkit Transistor Tester Untested/Parts & Repair With Manual

Heathkit Transistor-Diode Checker Model IT-27 Assembly Manual

Vintage Heathkit IT-18 Transistor Tester, Circa 1968-1976, Tested and Working

Heathkit Daystrom Model IT-10 Transistor-Diode Checker Untested

Vintage Heathkit IT-121 FET / Transistor Tester

IT-18 Transistor Tester ‎MPN 309410-001 -- Untested/Parts & Repair