psych, when I first started with the heaters that can be "calibrated" I did "calibrate" it. I got the tank to the temp I wanted and moved the ring so it was spot on. Later I moved the heater to another tank it was off. That little ring means about nothing. It is telling you about where you are. Your real goal should be to get the heater to deliver the temp you want according to a thermometer you trust and pretty much forget about the marketing gimmick.
I try to. I really do. But it's hard to mind you as my elder.
Dilution is the solution for the pollution.
Quote me as saying I was misquoted.
Once you get rid of integrity the rest is a piece of cake.
Here's to our wives and sweethearts - may they never meet.
If you agreed with me we'd both be right.