Along with books and websites I still need more things to accurately find out what kind of coins I have. So I bought a scale after months searching and asking many dealers and collectors.
The scale I finally settled on is the DigiWeigh DW-100AS. It is a pocket precsion digital scale with a 100g x 0.01g accuracy.

It came with a 100 gram weight for calibrations.

Here it is weighing a copper-dime.

The sale is very accurate. It does need an occasional re-calibration when the scale gets moved a alot but it's not annoying.
The feel is solid and better then I expected from a mostly plastic scale. It isn't exactly pocket friendly.
The price was $29.99 + $8.37 for shipping and handling but since I used my Amazon credit card it came out to be free, yes FREE with the first time discount.
Although I saw if you buy it and sign up for a Stamps.com account you get a $30.00 rebate. Here is their official website plus the link to the rebate at the top of their page.
Here is where I bought it from Amazon Scale
Do you have a coin and want to know its value? Leave a comment/question and I will do my best to find out the price and history for you.