Finding a cheap frequency display module for car audio

[justinreeves]

Hell oI am trying to find a pre-made frequency display module that I connect to a transistor for oscillation reference.
Does anyone know a good place to get a cheap one.
Im only a car audio tech so i need something simple.

 

[Cliff_J]

How high of a frequency? Some DVMs like a Fluke 87 have this built in already and is good to 200KHz.

 

[berkeman]

I googled kit frequency counter, and got lots of good hits. Check out the first one on the list:

http://www.google.com/search?hl=en&q=kit+frequency+counter

 

[justinreeves]

Yeah I don't need a testing device I need a add on module for a PWM circuit for frequency reference.Yeah like this.Thanks.