Recommendations for a vacum tube tester

@tksteingraber Usually when there are multiple scales for umhOs, there is a switch to go along with it. So this particular example is puzzling. Unless the meter was replaced at some point. I've used a tester like this, but the last time I saw one was about 23 years ago... As I recall though, it worked pretty well.

@atmasphere Yes the english setting dial has three settings(red dots) one for each of the 3 scales to measure and compare against the chart listing. 0-3000, 3001-6000, 6000+

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