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My questions are to do with an electronic sight glass that I have. But don't have an operators manual for. The clamp on sensors, how far should they be apart? And also in charging an AC system, should you always or usually have liquid after the condenser where you would be testing? Somewhere it seems I heard that it is 'Ok' to have bubbles in the line where you would be testing for example in an automotive system with R134a? Just tossing these questions out! Thanks