If your outdoor cooker already has a grill thermometer, great! If not, it's a simple matter to install one. Ideally, the thermometer will be mounted so the probe is at the same level as the cooking food.
The temperature inside a smoker or grill us usually higher near the top. A thermometer mounted there will give a false impression of the temperature.
For the most accurate temperature measurement, mount the thermometer on the side, just a few inches above the grate, at the same level as the food.
Grill Thermometer Mounting InstructionsMounting a smoker thermometer on your smoker takes only three easy steps.
Mounting requires drilling a 3/8 inch hole. This one looks like a good quality thermometer, but for my money, (and yours), you'd be better off going to a large home supply retail store and checking the grill section. You should be able to find one there for a very reasonable price.
If you want consistently great barbecued and smoked food, a grill thermometer is a must. Keep that fire burning low and slow and you'll end up with great food every time!