Thermometers read temperature, period. It doesn't matter if the cooker is a smoker, grill, oven or hairdryer.
If I understand the question, you want an accurate Internal Temperature thermometer.
Many here use a Maverick for the IT read and remote capabilities.
For simple quick read therms, the Thermapen is great. A more budget friendly choice is a Polder digital instant read ($30).
As you will read here, internal temp doesn't mean done.
I use my IT therm for guidance towards when to start checking for doneness.
The above may sound confusing but, the internal temp of a product does not truly indicate when that product is done.
The product is done when it meets the level of doneness that you want.