Thermometers are Easy to Use. Here's How:
There are the 'leave-in' style meat thermometers. These are inserted into the thickest part of the meat and remain for the duration of cooking.
'Instant-read' thermometers can be inserted during the cooking to obtain a temperature reading and then removed.
Digital probe thermometers are more costly, but superior when cooking roasts or large pieces in the covered barbecue. A thin sensor that probes the meat is left in the meat while it cooks. The info is available on a small digital display monitor outside the BBQ which updates throughout the cooking.
Whatever the type of thermometer you choose, ensure you read the operating instructions thoroughly before use.