is there a device that I can buy that is a db rating device

[rookanga 10+ year member]

like something that I can buy and put in my car to see how many db (decimals) I have or do they make something like that I can buy

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[tEh koRnDog 5,000+ posts]

Termlab

 

[tEh koRnDog 5,000+ posts]

A db meter.

 

[jdawg 5,000+ posts]

a microphone

edit- you are going to have to talk to your math teacher about your decimal problem, not a car audio forum

 

[tEh koRnDog 5,000+ posts]

hahahahaha

 

[allout13 10+ year member]

this one is expensive, but it is the standard in car audio.

http://termpro.com/term-lab/index.asp

there is also one called a make it louder meter that measures similar to the term-lab except much cheaper. they use to sell them cheaper on ebay, but here is the link.

http://makeitlouder.com/products_soundmeter.html