Currently 90F and since yesterday the hi/low have been 122.6V/114.6V. At the moment it is 119.49V.
This also displays a graphical representation of the voltage over time.
I wish I would have had this a few years ago. This house was built in 1960 with electric baseboard heating.
Since buying it in 1983 we have added on and installed central air and LPG heating. The additions and changes required a new subpanel. A couple of years ago we started to have circuit problems with weak breakers. The breakers were obsolete and replacements were not easily available. IR inspection showed a few "hot spots". Plus water had been leaking into the main panel where the outside feed penetrated the wall.
So---it was time to change the main panel and fix the original problem. This device would have shown those issues earlier than I noticed them. The good news is----now all is well.
"A pessimist sees the difficulty in every opportunity, an optimist sees the opportunity in every difficulty” ---Sir Winston Churchill
"Political extremism involves two prime ingredients: an excessively simple diagnosis of the world's ills, and a conviction that there are identifiable villains back of it all." ---John W. Gardner
“You can’t go back and change the beginning, but you can start where you are and change the ending.” ---C. S. Lewis