Heathkit IT-27 Transistor and Diode Tester w/ 3 test leads, Operation manual.

Heathkit IT-27 Transistor and Diode Checker / Tester With Assembly Manual

Vintage Heathkit Transistor Checker Kit Model IT-18 Tester

Heathkit IT-27 Transistor Tester Leakage Gain PNP NPN Vintage Test Equipment

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

Heathkit IT-27 Transistor and Diode Tester -

Heathkit Transistor Tester model IT-27 ~ UNTESTED, so listing as FOR PARTS . . .

Heathkit Transistor Tester model IT-18