This is a wonderful video by Vito on how to control the oven temperature when you are cooking Neapolitan Pizza.
Vito explains you need to look at the color of the brick to make sure it is white rather than black.
This will ensure an even temperature of the oven. You want ot make sure the bricks are not black as this will indicate the temperature is to low to cook Neapolitan pizza.
You also want to look at the floor temperature of the oven.
For this I would recommend a digital infrared thermometer. I have one and while I do not have a wood fired pizza oven I use it to check out the temperature of my baking steel:
Here is the laser thermometer I use,
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