I have a WSM 18.5" "Classic" that does not have the thermometer on the lid;so, for many years I have relied on my "Maverick" ET-732 and then the ET-733 which have never failed me. Also, within the last year I have bought some "backups" from Thermoworks.Com., i.e. "Chef Alarm", "ThermoPop", "Super-Fast ThermaPen,"Thermoworks RT301WA,"IR-GUN-S" which have proven very reliable.