The detailed model number is: WS-1500EPM, Programmable PID Controller for Electric Smoker
Starting at: $140.00
•Model: WS-1500EPM
Excerpt from the web page: Product Description:
This plug-and-play PID temperature controller is for controlling the temperature of the Bradley Smoker, Brinkmann Smoker and other electric smokers. The original temperature control mechanism of the Bradley Smoker is unstable and inaccurate. For the same dial position, the smoking temperature can vary significantly depending on content in the smoker, the ambient temperature, the wind speed, the ambient humidity, and even the direction of sunshine. This controller uses a PID algorithm to automatically adjust power to the heater, in order to compensate for these disturbances. This temperature control can hold the smoking temperature within one degree precision.
This controller is equipped with an industrial grade RTD sensor (class A Pt100 sensor). It is more accurate, more reliable, and covers wider temperature range than thermistor sensors that are commonly used in home appliances. Two sensor configurations are offered. 1) Multi-purpose RTD sensor, which has 6 ft long, double jacked three conductor, high temperature cable. It is can be used for smoker temperature control.
This seems to work perfectly, my good friend "Smoky" and I tested this and it holds the temp as expected.