This is less direct than you’d think. Though the feature remains in demand, stock thermostats simply cannot offer consistent — or accurate — results, at least not until someone invents a smoker with completely uniform temperature (spoiler alert: that’s not how heat works). The only foolproof method is a BBQ temperature controller, which will generally do all the heavy lifting of oxygen intake and heat management for you. You can also stand to invest in a calibrated thermometer. In particular, wireless remote one will serve you, as opening the smoker lid can introduce a sweeping change of variables.