Exactly the part I needed to fix my Kill a Watt performance monitor. In my experience, all of these safety devices fail over time, not from overheating. It should open at 99 degrees Celsius or 210 degrees Fahrenheit. Am I 100% sure none of these error conditions have occurred? So if your power monitor is dead then this is what you need. Along with the ability to remove the old one and solder the new one back in. Suggestion: When soldering back to the board, grab the terminal of your soldering pliers to prevent soldering heat from spreading. lead and weaken or destroy a new one.