Sekonic L-578DR Digitalmaster Spot Meter Light Meter -Clean-
This is a high end light meter made by Sekonic that is actually the first multi-function light meter that can be calibrated to match the sensitivity of your sensor. I like Sekonic meters and use them for my own photography. This one has a nice spot meter function which allows you to check exposure on very specific parts of your image that an ambient meter cannot do.
If you want to dial in your contrast ratio or check specific exposures, this is what you need.