The SOHC/4 World Tour is in under way.
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You don't need anhthing special. Hold left hand in front of headlamp. Then rev with right hand and see if output of headlight increases. If so, all is well. If you must, you can do it every time you're waiting at a traffic light. In case you insist on playing with meters, then this: occasionally, say at the start of a new riding season, you may want to check using a voltmeter. Realise that when testing dynamically an analogue meter is easier to read than a digital one.