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

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

Heathkit Transistor Tester Model IT-27 - Used

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

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

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

Heathkit IT-27 Transistor and Diode Tester -

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