Join Date: Oct 2005
Bikes: Marin mtb turned tri turned commuter turned singlespeed, Haro Werks 2.0, Specialized Epic Allez carbon main tube built up for triathlons
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um... you need a voltmeter to check the voltage. you can just get a multimeter (pronounced either MUL-ti-MET-er or mul-TIM-et-er). they read volts, amps, and ohms. You can get a cheap one for around $10. It'll have either a display screen or needle, a function selection knob, and red and black probes.
I'm rather disappointed by your Radio Shack. That store is apparently run by idiots. (btw, an altimeter is used to measure altitude).