I think he's talking about a 'voltage indicator', not just a test lamp (i.e. one with LEDs or whatever to indicate the approx level of voltage). Although 'calibration' is, I agree, a somewhat OTT concept for such a thing, I suppose they can check to confirm that the voltage indications are roughly correct!
Well, I suppose that such reassurance it always nice to have, but I'm not sure that I would personally bother with a voltage indicator - which should be 'proved' in some way every time it's used, anyway.
... but where do you stop in this quest for reassurance? Do you have your insulated tools regularly checked (potentially far more of a hazard than a 'miscalibrated' voltage indicator, I would have thought), and your crimping tools, and ....?
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