Is this the correct way to test your sourdough starter ?

Is this the correct way to test your sourdough starter ?

Hello :  I kept my starter going for a while and just fed it about two hours ago. It is not bubbling now but I hope that it will after 4-5 hours.

I remembered reading Tartine Bread book at the Barnes and Noble book store and it said “to test if your starter is ready is to do a “float test” . I did and drop about 1 tablespoon of starter into a cup of water. The starter sinks to the bottom which according to Chad Robertson, the Starter is not ready!!!

I was surprised since I had been using my starter without any problem for a while. So… what to do???

Thanks.

thaichef.

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Source: Fresh Loaf