[GreenKeys] tuning fork frequency?

[Peter Gottlieb]

How about a LED and resistor wand?  Could even mount one in there 
permanently.



Jim Haynes wrote:
>
>
> On Sat, 15 Mar 2008, Randy or Sherry Guttery wrote:
>
>> David Ross wrote:
>>
>>> What tuning fork should I use to check the speed of a Model 28 KSR 
>>> motor?
>>
>> 120cps.
>>
> Which suggests you could use a fluorescent light rather than a tuning
> fork.
>
>
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