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Electric-bulb tester

Electric-bulb tester
With the electric-bulb tester you cannot only verify whether a bulb is still in working order, but, if so, also find its wattage. True, this power rating is normally stated on the bulb, but it happens frequently that, after a time, this is no langer legible. The tester indicates whether the bulb in question is rated at 15, 25, 40, 60, 75 or 100 watt. Now, isn't that handy?
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