This is a Hickok model 572 Mutual Conductance Vacuum tube tester. The Hickok model 572 has some special features not found on other Hickok tube testers. One of these features is the ability to check double section tubes (like 6SN7, 12AX7) without resetting the selector switches to test the second triode. You simply push the \"Plate 2\" button and the quality of the second tube section is automatically registered on the meter. This tube tester looks very good and is in working condition. It comes with a operating manual. This can be returned for a refund if not happy.

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