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I don't trust those coolant tester. What you could do is also leave the radiator cap off and crank the car. If coolant start shooting. BHG.
Hahah, well I can't help if you don't trust those testers. But there is always ALWAYS bubbles coming up no matter how much I flush the system.
I back flush the system so it gets rid of bubbles starting from the back of the engnine to the front of the radiator.
I am not talking about 1 or 2 bubbles, I mean the upper radiator hose would be full one moment then the next it seems that it is filled with air. BTW coolant has shot up before, but only when it first started up.
Since gas is always getting into the system, there is no pressure working for the water pump.