This is a self-control thermostat, specifically a CTW-300 model, designed for electric skillets and multi-cookers. It allows for easy temperature adjustment to achieve desired heat levels for cooking. It is suitable for use with various electric cooking appliances like deep fryers, grills, and electric frying pans. The design, typically in black, blends well with most kitchen appliances. The thermostat comes with a wire for easy installation.
eBay