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No, in most cases you will achieve better results with a meter then a test kit because most chemical test kits are subjective.
No; drop size, concentration and color variation will provide inaccurate results. Only use the reagents made by the manufacturer of your test kit.
Typically one season. Reagents lose their strength over time and can also be ruined by direct sunlight and temperature extremes. Replace your reagents annually. Reagents (or test strips) that give suspect readings should be looked at suspicously.
There are many different types of test kits commercially available. If you are concerned about accuracy, (and you should be) you will want to spend more for a nice kit.
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