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The problem has been after a period of time the meter is no longer able read through the little windows on the side of the fitting.Not sure whats causing it.It's possible that the window is made up of a non barrier type of material and is allowing O2 to pass through and clouding it up.To me it looks like they are just getting dirty from the system fluid.
I've heard cleaning the system with TSP has helped,but personally I haven't tried it.
I hope the problem gets worked out because I love balancing systems with that hand held meter.