Used with 110VAC (so ~75W). Tested with heater on a metal tray. Thermostat seems to work well, measured 65 - 80C at sensor unit (T2). At full power, element (T1) reached ~240C and external plastic (T2) reached ~100 - 120C on surfaces not in contact with metal plate (sensor unit adjacent to metal plate). Delivery was timely. Happy with unit, will use in filament dryer so needed to know external temps to select safety fuses.