I can't say for certain how accurate it is but it's close. I bought it to install a 50amp breaker in my box. While I was in there decided to check all of my other breakers. I'm glad I did. My house and panel are 20 years old and has never been touched. I noticed every breaker in there was not up to the specified torque. Some were very lose which I'm sure could have caused issues such as heat buildup or worse.