Hi Lawrence, i too own a little Heathkit transistor tester, Model IT-27, nothing spectacular, it tests diodes as well, npn and pnp, battwery powered, edge meter at front, link below shows what it looks like...regards Alan.
http://www.radiomuseum.org/r/heath_trans...it_27.html
http://www.radiomuseum.org/r/heath_trans...it_27.html






