Re: Refixing meter glass.
I use non-acid cure black silicone rubber for this task. It takes a long time to set at least 24Hrs. It is important to make sure it is applied everywhere to get a seal, or dust and atmospheric contaminants can enter around the perimeter where the glass is not perfectly approximated to the housing surfaces. Excess is easily wiped off the class with a lint free cloth soaked with some meths.
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