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Just picked one of these up the other day and man it's sweet. Great job by Bruce and Randy to put this thing together. Some of it's useful features are it reads the plate voltage,Cathode current and the total power in the display. If there is a bad connection or loose tube socket it will show 0 for that parameter in the display. You can purchase 8 and 9 pin sockets and comes with complete instruction booklet. Runs on a 9 volt DC battery and has a automatic power saver feature for saving the battery if you accidently leave the bias probe plugged in which is what turns it on in the first place. Excellent meter and well made ad worth every penny. Nice job fellows !