Ok, this little item is for actually measuring your water temperature either at the machine itself, in line, or at the cleaning tool itself. (its always nice to know what temperature the water is that burns you). A digital temperature gauge connected in an assembly with quick disconnects for ease of installation, you can know the exact temperature of your water. Its always nice to know how hot the water is that burns you. And another up side to this little toy is that when you are in the house cleaning and you check the temperature gauge alot.....the home owner gets the idea that you are some kind of real high tech kinda guy.....or something.