Instruct: Classify Amazon reviews into positive or negative sentiment
Query: The test result is not accurate

I got this Kem-Tek 450 5-Way Pool Test Kit a few weeks ago. The color code with the first test shows the CH reading is above 5-10 which is way above the normal result. I tested the water again today and got same result. I took the water sample for professional water test. Both CH and Ph are good. I am not sure if the test kit chemistry already expired when I receive it a few weeks ago as no expiration date marked on the small bottles.