I have an extra one I'm not using. It tests 4,5,6,7 pin large, regular and miniature, octal, loctal, 9-pin miniature tubes, nuvistors and pilot lamps. It checks: emission, open or shorted tube elements, Cathode-to-filiment leakage, and a GAS test. It also has a line voltage adj., Illuminated Speed roll chart (Lists over 700 types) also has a supplementary tube chart. $75.
